# LLMs.txt - Sitemap for AI content discovery # Learn more:https://kb.mailster.co/ai-sitemap/ # Mailster Knowledge Base > --- ## Posts - [Time-Based Sending](https://kb.mailster.co/time-based-sending/): Mailster's Time Frame settings allow you to control when email campaigns and autoresponders are sent, enhancing engagement and respecting recipients'... - [Shortcodes](https://kb.mailster.co/shortcodes/): Mailster offers five handy shortcodes for easy newsletter integration. Use to embed campaigns, for recent newsletters, and for sign-up forms.... - [Widgets](https://kb.mailster.co/widgets/): Mailster offers four handy widgets for your WordPress site, found under the Appearance menu. You can add a signup form,... - [Preheaders](https://kb.mailster.co/preheaders/): Preheaders are short phrases that boost your email's click-through rate by appearing in the preview pane of some email clients.... - [Notifications Template](https://kb.mailster.co/notifications-template/): Mailster can send transactional emails using a special template. Starting from version 4. 0, it uses a base template, typically... - [Auto responder](https://kb.mailster.co/auto-responder/): Mailster's auto-responder feature automates your email marketing with six types, including subscriber-based, action-based, and time-based options. It lets you send... - [Custom Fields](https://kb.mailster.co/custom-fields/): With custom fields in Mailster, you can enhance subscriber info beyond the basics like email and name. Add details like... - [Subscriber Detail](https://kb.mailster.co/subscriber-detail/): Each subscriber has a detailed page with their email, name, status, subscription info, GDPR consent, custom fields, and more. You’ll... - [Security Settings](https://kb.mailster.co/security-settings/): Mailster's Security Settings enhance campaign protection by validating emails, blocking spam, and preventing duplicate signups. Key features include MX record... - [Do Not Track (DNT)](https://kb.mailster.co/do-not-track-dnt/): The Do Not Track (DNT) mechanism allows users to signal their preference against online tracking via a browser setting. Despite... - [Mail App Unsubscribe](https://kb.mailster.co/mail-app-unsubscribe/): Mailster includes a List Unsubscribe Header in newsletter campaigns, facilitating easy opt-outs through mailto or URL links. This feature enhances... - [Capablities in Mailster](https://kb.mailster.co/capablities-in-mailster/): Mailster empowers WordPress users by providing customizable role-based access to manage campaigns, subscribers, and templates. With default roles like Administrator... - [How to change ownership of a license?](https://kb.mailster.co/how-to-change-ownership-of-a-license/): Easily transfer your Mailster license via the WordPress dashboard by navigating to "Newsletter" > "Account," editing the email address, and... - [Email Automation Trigger: Tag removed](https://kb.mailster.co/email-automation-trigger-tag-removed/): This trigger kicks off a workflow whenever a tag is removed from a subscriber. You can also set it to... - [Email Automation Trigger: Subscriber removed to a list ](https://kb.mailster.co/email-automation-trigger-subscriber-removed-to-a-list/): This trigger kicks off a workflow anytime a subscriber is removed from a list. You can also set it up... - [Email Automation Trigger: Subscriber added to a list](https://kb.mailster.co/email-automation-trigger-subscriber-added-to-a-list/): This trigger kicks off a workflow whenever a subscriber is added or removed from a list, no matter who did... - [Email Automation Trigger: Tag added](https://kb.mailster.co/email-automation-trigger-tag-added/): This trigger kicks off a workflow whenever a tag is added or removed from a subscriber, no matter who made... - [Email Automation Trigger: Field updated](https://kb.mailster.co/email-automation-trigger-field-updated/): This trigger kicks off a workflow when a specific subscriber field is added or updated. You can set which field... - [Email Automation Trigger: Form Conversion](https://kb.mailster.co/email-automation-trigger-form-conversion/): This trigger kicks off a workflow when a user signs up and confirms their subscription through a chosen form. If... - [Email Automation Trigger: Click a link](https://kb.mailster.co/email-automation-trigger-click-a-link/): Set up a workflow that activates when specific links are clicked in your campaigns. You can track both internal and... - [Email Automation Trigger: Visits a page](https://kb.mailster.co/email-automation-trigger-visits-a-page/): You can set up workflows to trigger when subscribers visit specific pages on your website. To qualify, they must have... - [Email Automation Trigger: Custom Hook](https://kb.mailster.co/email-automation-trigger-custom-hook/): You can run a workflow with custom PHP code by using "Custom Hook" as your trigger. Define the hook's name,... - [Email Automation Trigger: Anniversary](https://kb.mailster.co/email-automation-trigger-anniversary/): Celebrate your subscribers' special moments with anniversary workflows! Use specific dates for all subscribers or custom field dates for personalized... - [Email Automation Trigger: Specific date](https://kb.mailster.co/email-automation-trigger-specific-date/): This trigger launches a workflow on a set date, perfect for sending birthday or anniversary messages. You can use specific... - [Upgrading Your License](https://kb.mailster.co/upgrading-your-license/): With Mailster, you can easily switch or upgrade your plan anytime. Simply access the "Account" page in the WordPress Dashboard... - [Missing or wrong Translations](https://kb.mailster.co/missing-or-wrong-translations/): Mailster supports over 20 languages, featuring 3,500 strings. To help maintain accurate translations, join our Translator Program and receive a... - [Inspect the Queue of your Workflow Step](https://kb.mailster.co/inspect-the-queue-of-your-workflow-step/): In Mailster, steps typically process in sequence, but certain actions like Delay or Email may require queuing subscribers. The current... - [Email Automation: Notification](https://kb.mailster.co/email-automation-notification/): Set up email notifications in your workflow by adding a Notification step. Enter the recipient's email, define a subject, and... - [Email Automation: Jumper](https://kb.mailster.co/email-automation-jumper/): Jumpers streamline your workflow by allowing you to skip steps or navigate to specific points in the customer journey. Easily... - [How to manage your licenses for Mailster](https://kb.mailster.co/how-to-manage-your-licenses-for-mailster/): Freemius uses license keys for product access, ensuring support and automatic updates. After purchase, you'll receive an email with your... - [Email Health Check](https://kb.mailster.co/email-health-check/): Gmail and Yahoo will enforce new sender authentication policies from February 1, 2024, targeting bulk senders—those emailing over 5,000 recipients... - [Using Custom Modules](https://kb.mailster.co/custom-modules/): Modules are customizable sections in your newsletter templates, allowing you to drag and drop various blocks to design your emails.... - [Send your Newsletters via MailJet](https://kb.mailster.co/send-your-newsletters-via-mailjet/): Mailjet is an efficient email marketing tool that integrates with Mailster, offering robust bounce handling support. To get started, create... - [Convert your Legacy Forms](https://kb.mailster.co/convert-your-legacy-forms/): Mailster 4. 0 introduces a new form builder based on the WordPress block editor, requiring users to convert existing legacy... - [Email Automation: Email](https://kb.mailster.co/email-automation-email/): At this stage, an email is sent to subscribers, allowing for campaign customization and tracking. Ensure a reasonable delay between... - [Email Automation: Delay](https://kb.mailster.co/email-automation-delay/): Incorporating a delay step in your workflow introduces a strategic pause, allowing for better timing of subsequent actions. Options include... - [Email Automation: Actions](https://kb.mailster.co/email-automation-actions/): Mailster's actions enhance your email automation workflow by allowing you to update custom fields, manage subscriber lists, add or remove... - [Email Automation: Triggers](https://kb.mailster.co/email-automation-triggers/): Mailster's email marketing automation allows you to create workflows initiated by triggers. With up to five available triggers—like subscriber additions,... - [Email Automation in WordPress](https://kb.mailster.co/email-automation-in-wordpress/): Mailster automates email marketing, enhancing communication and customer engagement through customizable workflows. Key components include triggers and actions, allowing for... - [How can I setup the newsletter homepage?](https://kb.mailster.co/how-can-i-setup-the-newsletter-homepage/): To set up your newsletter with Mailster, create a static homepage to manage subscriptions. This page, called "Newsletter," is auto-generated... - [Convert your Newsletter Homepage](https://kb.mailster.co/convert-your-newsletter-homepage/): Upgrade your newsletter homepage by migrating from shortcodes to new block forms. Remove outdated shortcodes (, , ) and add... - [Update Billing Details and Access Invoices](https://kb.mailster.co/update-billing-details-and-access-invoices/): Updating your Freemius billing information is easy! Log in to your account at https://mailster. co/account, go to My Profile, and... - [Change the length of the excerpt](https://kb.mailster.co/change-the-length-of-the-excerpt/): WordPress allows customization of excerpt length through the excerpt_length filter. Mailster offers a similar feature using the mailster_excerpt_length filter, enabling... - [Why does my Legacy license expire?](https://kb.mailster.co/why-does-my-legacy-license-expire/): If you purchased an Envato license after October 1, 2022, it will expire in five months, halting automatic updates via... - [How can I upgrade my license?](https://kb.mailster.co/how-can-i-upgrade-my-license/): Upgrade your license directly from the plugin by navigating to Newsletter => Account and clicking "Change Plan. " Enter your... - [Logging Outgoing Mails in Mailster](https://kb.mailster.co/logging-outgoing-mails-in-mailster/): Mailster allows you to log outgoing emails in WordPress. Enable logging in the Newsletter settings, define entry limits, and access... - [Licensing Information](https://kb.mailster.co/licensing-information/): You can purchase Mailster from either mailster. co or CodeCanyon. Each license is domain-specific, allowing use on unlimited subdirectories. You... - [Static Map Service](https://kb.mailster.co/static-map-service/): Mailster offers three static map options: no maps, OpenStreetMaps for privacy, or Google Maps for high-quality visuals. Adjust your preference... - [Block Forms](https://kb.mailster.co/block-forms/): Manage your block forms easily through the "Block Forms" menu in the Newsletter section. Create new forms with templates, customize... - [Templates](https://kb.mailster.co/templates/): Mailster templates shape your campaign's design, accessible under Newsletter => Templates in your WordPress Dashboard. You can upload purchased or... - [Create Custom Templates](https://kb.mailster.co/create-custom-templates/): A Mailster Template is a folder with essential files for creating email templates. It must include at least two files:... - [Delete Subscribers](https://kb.mailster.co/delete-subscribers/): You can easily delete subscribers in Mailster to keep your list healthy. Use the Delete Subscribers page for bulk actions,... - [Finished Campaigns](https://kb.mailster.co/finished-campaigns/): Mailster offers in-depth campaign statistics, including total recipients, click rates, device usage, and geographic location of opens. You can filter... - [Subscribers Overview](https://kb.mailster.co/subscribers-overview/): Mailster makes it easy to manage your subscribers right in WordPress. You can view, search, and filter subscribers by status.... - [Campaign Overview](https://kb.mailster.co/campaign-overview/): The Campaign Overview page provides a snapshot of all your campaigns, displaying subscriber statuses and performance metrics. Campaigns can have... - [Frontpage](https://kb.mailster.co/frontpage/): The Frontpage displays your newsletter in a web format, featuring navigation buttons, a share option, and customizable settings. You can... - [The Campaign Editor](https://kb.mailster.co/the-campaign-editor/): The Mailster campaign editor simplifies campaign creation, allowing users to design campaigns and autoresponders easily. Key features include customizable titles,... - [Campaign Precheck](https://kb.mailster.co/precheck/): Mailster's Precheck feature allows you to efficiently assess your campaign's deliverability. It analyzes subject lines, links, images, and provides a... - [I have problems with sending campaigns.](https://kb.mailster.co/i-have-problems-with-sending-campaigns/): If you experience issues sending your campaigns, verify your cron setup, as it's crucial for successful delivery. Check for cron... - [How to read metrics on the campaign overview page.](https://kb.mailster.co/how-to-read-metrics-on-the-campaign-overview-page/): The Campaign Overview page provides insights into campaign performance, highlighting key metrics. With 8,318 total receivers, the campaign achieved a... - [How do I import my subscribers?](https://kb.mailster.co/how-do-i-import-my-subscribers/): Before launching your first email campaign with Mailster, import your existing subscribers on the “Manage Subscribers” page. You can upload... - [Migrating your license to Freemius](https://kb.mailster.co/migrating-your-license-to-freemius/): To continue using Mailster after purchasing it on Envato, migrate your license to Freemius via the WordPress Dashboard. Enter your... - [Use Advanced Custom Fields in your Newsletter Campaigns](https://kb.mailster.co/use-advanced-custom-fields-in-your-newsletter-campaigns/): Advanced Custom Fields (ACF) enhances WordPress by allowing users to add custom fields to edit screens, streamlining website development and... - [Trigger Custom Javascript on Form Submission](https://kb.mailster.co/trigger-custom-javascript-on-form-submission/): Mailster Block Forms allows you to run custom JavaScript to track form submissions via Analytics. Access the "Events" section to... - [Warm up your email delivery method](https://kb.mailster.co/warm-up-your-email-delivery-method/): When starting with email marketing or changing providers, avoid sending too many emails at once. Use Mailster’s Warmup settings to... - [Send your emails as fast as possible](https://kb.mailster.co/send-your-emails-as-fast-as-possible/): Mailster sends emails in batches to avoid server timeouts and delivery bans. You can enable automatic batch size adjustment based... - [Prevent spam filters from automatically opening and clicking through links in your campaigns](https://kb.mailster.co/prevent-spam-filters-from-automatically-opening-and-clicking-through-links-in-your-campaigns/): Email spam filters may click links in your emails, leading to false open rates and unintended unsubscribes. Mailster offers an... - [How many mails can I send at once?](https://kb.mailster.co/how-many-mails-can-i-send-at-once/): Optimize your email marketing by balancing throughput rate and batch size to avoid server timeouts. Determine your server's email capacity... - [Manually replacing a Mailster version](https://kb.mailster.co/manually-replacing-a-mailster-version/): Mailster includes security features to protect against malicious versions. To ensure you have a legitimate copy, obtain a valid license... - [Mailster Customization Services](https://kb.mailster.co/mailster-customization-services/): Need custom website work? Partner with Codeable, the leading WordPress freelancer platform. Simply fill out a form for a direct... - [Sending post-purchase coupon codes to WooCommerce customers.](https://kb.mailster.co/sending-post-purchase-coupon-codes-to-woocommerce-customers/): Easily offer discounts to customers after purchases with Mailster and WooCommerce. Set up a customer journey that includes sending a... - [Send your newsletters via Gmail](https://kb.mailster.co/send-your-newsletters-via-gmail/): Gmail is a popular email provider, but it's not ideal for marketing due to strict limits and potential spam issues.... - [The Mailster Cookie](https://kb.mailster.co/the-mailster-cookie/): Mailster sets a cookie named "mailster" when a subscriber clicks a campaign link, allowing user identification even without an account... - [Grace Period](https://kb.mailster.co/grace-period/): Mailster allows multiple autoresponders to automate campaigns, utilizing a default one-week "Grace Period" to prevent accidental sends. Users can easily... - [List Based and Global Subscriptions](https://kb.mailster.co/list-based-and-global-subscriptions/): Mailster offers two subscription models: list-based (recommended for flexibility) and global subscriptions. Subscribers can unsubscribe from individual lists or all... - [Encode Tags for Links](https://kb.mailster.co/encode-tags-in-links/): When using Mailster tags in links, remember to encode them with PHP's rawurlencode. Prepend an exclamation mark (! ) to... - [RSS Email Campaigns](https://kb.mailster.co/rss-email-campaigns/): Mailster allows you to automate recurring autoresponders using RSS Feeds, ideal for integrating external content. For content from your own... - [Dynamic Custom Post Types](https://kb.mailster.co/dynamic-custom-post-types/): Mailster's dynamic tag engine allows you to create custom post types that generate content on demand, enabling endless possibilities for... - [Random Dynamic Posts](https://kb.mailster.co/random-dynamic-posts/): Mailster's random posts feature complements dynamic posts by displaying a random post under the same conditions. Using tags like {post_title:~7},... - [WordPress displays a 404 error after updating the campaign](https://kb.mailster.co/wordpress-displays-a-404-error-after-updating-the-campaign/): If your WordPress site redirects to /wp-admin/post. php, it may be due to misconfigured mod_security settings. This often stems from... - [Use Unsplash images in Email Campaigns](https://kb.mailster.co/unsplash/): With Mailster, access over 1,000,000 free photos through Unsplash directly in the editor. Easily add images to your email campaigns... - [What information will be tracked by opting into usage tracking?](https://kb.mailster.co/usage-tracking/): With Mailster 4. 0, usage tracking is optional during installation or updates. Opting in helps us improve features and fix... - [Why do my emails end up in the Gmail Promotions Tab?](https://kb.mailster.co/why-do-my-emails-end-up-in-the-gmail-promotions-tab/): To improve the chances of your Mailster campaigns landing in Gmail's Primary Inbox, minimize images, favor plain text, limit external... - [Permalink Structure](https://kb.mailster.co/permalink-structure/): Mailster utilizes custom rewrite rules for user navigation and link processing on the newsletter homepage. Issues with links may arise... - [I have problems registering the plugin](https://kb.mailster.co/i-have-problems-registering-the-plugin/): As of March 15, 2023, Mailster installation requires a valid purchase code for license activation. Common verification errors include invalid... - [Working with animated GIFs in Mailster](https://kb.mailster.co/working-with-animated-gifs-in-mailster/): Animated GIFs can enhance your email marketing, but Mailster's default image resizing may lose animation. To preserve it, use Mailster's... - [Handling Bounces with AmazonSNS](https://kb.mailster.co/handling-bounces-with-amazonsns/): To manage bounces more effectively with Amazon SES in Mailster, switch to Amazon SNS for enhanced control. Set up SNS... - [How many subscribers can Mailster handle?](https://kb.mailster.co/how-many-subscribers-can-mailster-handle/): Mailster offers unlimited subscribers, lists, forms, and campaigns, but server limits may affect performance. To optimize, maintain fewer subscribers, simplify... - [Send your Newsletters via SendGrid](https://kb.mailster.co/send-your-newsletters-via-sendgrid/): Integrate SendGrid with Mailster by signing up, creating an API key with specific permissions, and authenticating your sender. Choose between... - [How to migrate Mailster to a new site](https://kb.mailster.co/how-to-migrate-mailster-to-a-new-site/): To transfer Mailster from one site to another, back up both databases, optionally export data, and copy the Mailster tables... - [User Ratings](https://kb.mailster.co/user-ratings/): Mailster's user ratings reflect subscriber engagement, updated with each interaction—opens and clicks boost ratings, while bounces and unsubscribes lower them.... - [Adding Content to your Forms](https://kb.mailster.co/adding-content-to-your-forms/): This article outlines how to customize Legacy Forms using Mailster. You can enhance forms with additional content by employing the... - [Disabling the Inline Editor](https://kb.mailster.co/disabling-the-inline-editor/): This article is outdated for the latest Mailster version. The Inline Editor enhances campaign creation efficiency. To revert to the... - [Mailster Subscriber Query](https://kb.mailster.co/subscriber-query/): Mailster simplifies subscriber segmentation with its Subscriber Query feature, allowing custom coding for tailored results. Users can query subscribers based... - [Using Multi language Newsletter with WPML](https://kb.mailster.co/using-multi-language-newsletter-with-wpml/): With Mailster and the WPML plugin, you can effortlessly create multi-language email campaigns. Set up forms and translate settings for... - [Security Nonce is invalid](https://kb.mailster.co/security-nonce-is-invalid/): Mailster forms use WordPress Nonces to prevent invalid submissions, but these can expire after 24 hours, often due to caching.... - [Mailster and GDPR](https://kb.mailster.co/gdpr/): The GDPR, effective May 25, 2018, mandates key principles for data protection, including obtaining consent, the right to access, the... - [Mail Headers in Mailster](https://kb.mailster.co/mail-headers-in-mailster/): Mailster sends emails as multi-part MIME messages with headers that identify the sender and campaign. Key headers include version numbers,... - [Adding Posts to your Campaign](https://kb.mailster.co/adding-posts-to-your-campaign/): Mailster offers seamless integration with WordPress, allowing users to easily add posts, pages, or custom post types to campaigns. You... - [WordPress Users in Mailster](https://kb.mailster.co/wordpress-users-in-mailster/): Mailster allows seamless integration of WordPress users into your subscriber list. It offers automatic linking for matching emails, user import... - [Send your Newsletters via Mailgun](https://kb.mailster.co/send-your-newsletters-via-mailgun/): Mailgun is a developer-friendly email provider that integrates seamlessly with Mailster for campaign sending. To get started, sign up, add... - [Validating Custom Fields](https://kb.mailster.co/validating-custom-fields/): Mailster allows you to create custom fields for subscriber information, such as a birthday field. By adding custom code, you... - [Send your Newsletters via SparkPost](https://kb.mailster.co/send-your-newsletters-via-sparkpost/): SparkPost is a reliable email delivery service that requires setup, including domain verification and API key creation. While it no... - [Using WooCommerce in your Newsletter Campaigns](https://kb.mailster.co/using-woocommerce-in-your-newsletter-campaigns/): Enhance your WooCommerce shop's outreach with Mailster's WooCommerce add-on. Effortlessly send auto-responder campaigns featuring your latest products. Utilize dynamic content,... - [Get the current subscriber](https://kb.mailster.co/get-the-current-subscriber/): Mailster provides methods to retrieve the current subscriber information and their ID. It sets a cookie with the subscriber's hash... - [Where are the module screenshots?](https://kb.mailster.co/where-are-the-module-screenshots/): Mailster generates template screenshots on our server, but issues may arise. Thumbnails may not appear due to uncreated images, server... - [Why does the {post_image} tag not work?](https://kb.mailster.co/why-does-the-post_image-tag-not-work/): The {post_image:X} tag in Mailster allows you to use a post's featured image within your email campaigns. Unlike other tags,... - [How to redirect after form submission?](https://kb.mailster.co/how-to-redirect-after-form-submission/): Mailster forms use AJAX for seamless submissions, providing users with confirmation messages. Users can redirect submissions to specific pages via... - [Keep certain tags in your campaigns](https://kb.mailster.co/keep-certain-tags-in-your-campaigns/): Mailster automatically removes unused tags from your campaign, but you can whitelist specific ones using the 'mailster_keep_tags' filter. Add your... - [Using Mailster Forms (Deprectated)](https://kb.mailster.co/using-mailster-forms/): Mailster offers versatile sign-up forms for various platforms, including WordPress and plain HTML. You can embed forms using shortcodes, a... - [Saving new Template Files](https://kb.mailster.co/saving-new-template-files/): Mailster Templates kickstart your campaigns by allowing customization. Choose a template, start a new campaign, and add desired modules. Save... - [Adding a Terms of Service checkbox to your forms](https://kb.mailster.co/adding-a-terms-of-service-checkbox-to-your-forms/): This article emphasizes the importance of compliance with email marketing laws using Mailster. It enables users to add a mandatory... - [Moving subscribers to different lists](https://kb.mailster.co/moving-subscribers-to-different-lists/): Easily manage subscriber lists in Mailster with simple UI options or custom code. You can assign or unassign subscribers based... - [Changing the static Auto Tag Output](https://kb.mailster.co/changing-the-static-auto-tag-output/): Mailster's auto feature allows you to manage static content by modifying the functions. php file. You can customize the output... - [Adding custom code to your website](https://kb.mailster.co/adding-custom-code-to-your-website/): To extend your WordPress site's functionality, you can add custom code in two ways: the theme's functions. php file, which... - [Adding a Date Picker to your forms](https://kb.mailster.co/adding-a-date-picker-to-your-forms/): For legacy forms, you can enhance date fields by adding a date picker using a simple code snippet. This allows... - [How to remove Visual Composer shortcodes in campaigns](https://kb.mailster.co/how-to-remove-visual-composer-shortcodes-in-campaigns/): If you're using Visual Composer in WordPress and encountering shortcode issues with Mailster, you can remove them by adding custom... - [Mails are send but not delivered](https://kb.mailster.co/mails-are-send-but-not-delivered/): Mailster's email delivery relies on your sending server's response, but a "success" message doesn't guarantee inbox delivery. Emails may end... - [Setup Automatic Bounce Handling](https://kb.mailster.co/setup-automatic-bounce-handling/): Mailster automates bounce processing with proper setup. Assign a dedicated bounce address, enter server credentials, and define bounce check options.... - [Mailster and WooCommerce](https://kb.mailster.co/mailster-and-woocommerce/): Enhance your WooCommerce shop with a free WordPress add-on to convert customers into newsletter subscribers. Automate email workflows based on... - [Access to admin-ajax.php is blocked](https://kb.mailster.co/access-to-admin-ajax-php-is-blocked/): The admin-ajax. php file is crucial for Mailster's backend functions. If it's blocked, issues may arise from plugin conflicts, host... - [Changing text snippets](https://kb.mailster.co/changing-text-snippets/): Mailster lets you customize internal text snippets easily. You can adjust them in the Text tab or use the `mailster_text`... - [Add custom dynamic tags to your newsletter](https://kb.mailster.co/add-custom-dynamic-tags-to-your-newsletter/): Enhance your newsletters with dynamic content using custom tags. By adding code snippets to your theme's functions. php, you can... - [Sending Plain Text Emails](https://kb.mailster.co/sending-plain-text-emails/): To send plain text-like emails in Mailster, create a new campaign, switch to code view, delete the existing HTML, and... - [How to add a Google Maps API Key](https://kb.mailster.co/how-to-add-a-google-maps-api-key/): Mailster integrates Google Maps to visualize subscriber locations. To set it up, create a Google API Key by enabling the... - [Add Subscribers](https://kb.mailster.co/add-subscribers/): Easily manage subscribers in Mailster using simple code. Add a single email or detailed subscriber info, update existing subscribers, assign... - [Mailster for Developers](https://kb.mailster.co/mailster-for-developers/): Mailster is built for developers, featuring hooks and filters for customization. You can add subscribers easily, manage lists, and even... - [Tags in Mailster](https://kb.mailster.co/tags-in-mailster/): Tags in Mailster serve as placeholders in your campaigns, dynamically replaced with subscriber-specific content during sending. Use the format {tagname}... - [Your First Campaign](https://kb.mailster.co/your-first-campaign/): Activate the plugin and create your first campaign via the "New Campaign" option in the "Newsletter" menu. Customize your campaign's... - [How to install Mailster](https://kb.mailster.co/how-to-install-mailster/): To install Mailster, go to the Plugins page, click "Add New," then "Upload Plugin. " Select the mailster-x. x. x-zip... - [Updating MyMail to Mailster](https://kb.mailster.co/updating-mymail-to-mailster/): We're excited to enhance your experience with Mailster by launching a new support and license center. This upgrade allows you... - [Working with action hook auto responders](https://kb.mailster.co/working-with-action-hook-auto-responders/): In this fourth part of our Mailster autoresponder series, we explore Action Hook Auto Responders. These advanced tools require WordPress... - [What is a Cron Lock?](https://kb.mailster.co/what-is-a-cron-lock/): Mailster prevents duplicate emails by creating a cron lock during campaign processing. If a lock is active, you'll see a... - [How to alter the buttons in the text editor?](https://kb.mailster.co/how-to-alter-the-buttons-in-the-text-editor/): Customize your email campaigns using a rich text editor by adding buttons for formatting, font selection, and size. To enhance... - [Post Thumbnail, Oembed, and Open Graph](https://kb.mailster.co/post-thumbnail-oembed-and-open-graph/): Enhance your newsletter campaigns with featured images directly from the editor, just like regular posts. Utilize Mailster's screenshot feature or... - [Subscriber Notification Options](https://kb.mailster.co/subscriber-notification-options/): Manage your subscriber notifications effectively! Enable a summary email for your seven most recent fans, complete with location maps and... - [Send your Newsletters via Amazon's SES](https://kb.mailster.co/send-your-newsletters-via-amazons-ses/): To effectively send newsletters, use a dedicated email service like Amazon SES. Install the Mailster plugin, set up your AWS... - [Changing the dynamic Auto Tag Output](https://kb.mailster.co/changing-the-dynamic-auto-tag-output/): Enhance your Mailster campaigns by customizing dynamic post content through your theme's functions. php file. Use a simple function to... - [SMTP Error: data not accepted](https://kb.mailster.co/smtp-error-data-not-accepted/): SMTP errors can arise from various issues: mismatched sender and username, oversized messages, blacklisted receivers, or temporary server limits. To... - [Why does support expire?](https://kb.mailster.co/why-does-support-expire/): Since September 2015, Envato offers 6 months of included support for purchases. Support can be renewed on the item page,... - [Translations in Mailster](https://kb.mailster.co/translations-in-mailster/): Mailster is a globally used tool with varying language support. To enhance localization, users can participate in the Translation Project,... - [Creating a series in Mailster](https://kb.mailster.co/creating-a-series-in-mailster/): This article recommends using Automation for creating engaging newsletter series in Mailster, known as drip campaigns. It outlines steps to... - [Troubleshooting WordPress in 60 Seconds](https://kb.mailster.co/troubleshooting-wordpress-in-60-seconds/): Mailster adheres to WordPress Coding Standards, ensuring compatibility with compliant plugins and themes. If issues arise, test on the demo... - [Why is my WordPress version no longer supported?](https://kb.mailster.co/why-is-my-wordpress-version-no-longer-supported/): WordPress updates introduce new features and bug fixes. While plugins that worked previously will likely continue to function, unsupported versions... - [Ignore certain Posts in your Campaigns](https://kb.mailster.co/ignore-certain-posts-in-your-campaigns/): Mailster allows you to automatically send your latest posts to subscribers while easily excluding specific articles. By adding a custom... - [Subscriber based timezone sending](https://kb.mailster.co/subscriber-based-timezone-sending/): Mailster allows you to send campaigns based on your subscribers' time zones, ensuring they receive emails at optimal times. Activate... - [Setup your Birthday campaign with autoresponders](https://kb.mailster.co/setup-your-birthday-campaign-with-autoresponders/): With Mailster, easily send birthday greetings to subscribers by adding a birthday custom field. Create a campaign, set it to... - [Build an Archive of your latest Newsletters](https://kb.mailster.co/build-an-archive-of-your-latest-newsletters/): Easily display your latest campaigns chronologically by enabling the option in Settings. Remember to update permalinks if necessary and flush... - [Add a list of your latest post in your campaign](https://kb.mailster.co/add-a-list-of-your-latest-post-in-your-campaign/): Engage your audience by linking to older blog articles, utilizing dynamic tags for a seamless experience. Enhance visibility with structured... - [Segmentation in Mailster](https://kb.mailster.co/segmentation-in-mailster/): Segmenting your audience allows for precise targeting in your marketing campaigns. Mailster enables you to create recipient lists and set... - [Track your clicks with Google Analytics](https://kb.mailster.co/track-your-clicks-with-google-analytics/): Mailster offers detailed insights into subscriber behavior, including clicks, opens, and unsubscriptions. Easily track your newsletter campaigns alongside website visitors... - [Get a notification on new subscribers](https://kb.mailster.co/get-a-notification-on-new-subscribers/): Easily receive notifications for new subscribers by enabling the option in the Subscribers tab of your settings. You can also... - [Use fullname instead of first- and lastname](https://kb.mailster.co/use-fullname-instead-of-first-and-lastname/): For personalized newsletters, replace the {firstname} and {lastname} tags with {fullname} for a cleaner greeting, like "Hello John! " Instead... - [What is DKIM (DomainKeys Identified Mail)?](https://kb.mailster.co/what-is-dkim-domainkeys-identified-mail/): DKIM (DomainKeys Identified Mail) links a domain to an email, ensuring authenticity. To enable DKIM, add a TXT record with... - [Working with time based auto responders](https://kb.mailster.co/working-with-time-based-auto-responders/): Time-based autoresponders send campaigns at specific intervals, like monthly updates of your latest posts. Set up a campaign by defining... - [Working with action-based autoresponders](https://kb.mailster.co/working-with-action-based-autoresponders/): Explore action-based autoresponders designed to launch campaigns after new content is published. Set up a campaign, define subject lines, and... - [Working with subscriber-based autoresponders](https://kb.mailster.co/working-with-subscriber-based-autoresponders/): Subscriber auto-responders send automated messages based on user actions like subscription or unsubscription. You can craft personalized welcome emails using... - [How to add salutation to your subscribers?](https://kb.mailster.co/how-to-add-salutation-to-your-subscribers/): To personalize subscriber greetings, establish custom fields for gender and salutation. Use code snippets to automate salutations based on gender... - [How can subscribers update their subscription?](https://kb.mailster.co/how-can-subscribers-update-their-subscription/): Enable subscribers to update their data by adding a {profile} tag in your newsletter campaigns. This redirects them to a... - [Why does tracking not work?](https://kb.mailster.co/why-does-tracking-not-work/): If your campaign statistics show no opens or clicks, try sending a test campaign to check links, ensure Mailster isn’t... - [How to handle bounces with SendGrid?](https://kb.mailster.co/how-to-handle-bounces-with-sendgrid/): To automatically manage bounces in Mailster using SendGrid, install the SendGrid Integration plugin. Choose SendGrid on the delivery tab to... - [How to solve database errors?](https://kb.mailster.co/how-to-solve-database-errors/): If you see an error about missing Mailster tables, visit your update page at https://yourdomain. com/wp-admin/admin. php? page=mailster_update (replace with... - [How does tracking in Mailster work?](https://kb.mailster.co/how-does-tracking-in-mailster-work/): Mailster enables tracking of opens, clicks, unsubscribes, and bounces. It counts opens via a small image loaded from your server;... - [Choosing your Delivery Method](https://kb.mailster.co/choosing-your-delivery-method/): Mailster offers two default delivery methods: Simple SMTP and SMTP. Simple SMTP is not recommended for bulk mailing due to... - [How can I increase the sending speed?](https://kb.mailster.co/how-can-i-increase-the-sending-speed/): To enhance Mailster's email delivery rates, consider reducing the cron interval, increasing the number of emails sent at once, or... - [Why do the links in my emails not work?](https://kb.mailster.co/why-do-the-links-in-my-emails-not-work/): If subscribers can't confirm their Mailster subscription or encounter broken links, ensure your permalink structure is set correctly (Settings =>... - [How can I use short codes in Mailster campaigns?](https://kb.mailster.co/how-can-i-use-short-codes-in-mailster-campaigns/): Shortcodes are disabled by default in Mailster to prevent HTML injection that could disrupt emails. Users can enable them in... - [SMTP Error: Could not connect to SMTP host.](https://kb.mailster.co/smtp-error-could-not-connect-to-smtp-host/): If you encounter an SMTP connection error, it’s likely due to your email service provider rejecting one of your email... - [How can I use Mailster with the wp_mail function?](https://kb.mailster.co/how-can-i-use-mailster-with-the-wp_mail-function/): Mailster allows you to enhance email delivery by overriding the default wp_mail function. Choose from three settings: bypass Mailster, use... - [How can I manually upload Mailster templates?](https://kb.mailster.co/how-can-i-manually-upload-mailster-templates/): Upload templates via FTP if the Templates section isn't suitable. Extract your downloaded archive and place the folder in "wp-content/uploads/mailster/templates"... - [How do I know if my cron is working correctly?](https://kb.mailster.co/how-do-i-know-if-my-cron-is-working-correctly/): Mailster requires a cron job to send campaigns. Check its status under Newsletter > Settings > Cron, where you can... - [Why do some of my subscribers get a status of "error"?](https://kb.mailster.co/why-do-some-of-my-subscribers-get-a-status-of-error/): When sending campaigns, subscribers may be marked as errors due to invalid email addresses, non-existent domains, or server rejections. While... - [How colors work with the Mailster Editor?](https://kb.mailster.co/how-colors-work-with-the-mailster-editor/): Colors in the Mailster Editor are determined by the template's HTML and only recognize 6-digit hex codes (e. g. ,... - [Why does the unsubscribe link not work?](https://kb.mailster.co/why-does-the-unsubscribe-link-not-work/): Occasionally, unsubscribe links in campaigns may lead to a "404 - Not Found" error. To resolve this, ensure Mailster is... - [How can I send newsletters via GoDaddy?](https://kb.mailster.co/how-can-i-send-newsletters-via-godaddy/): Using GoDaddy's email servers is possible but comes with restrictions. Limit your SMTP sends to 500 emails per account, ensure... - [How can I add a captcha to the sign up form?](https://kb.mailster.co/how-can-i-add-a-captcha-to-the-sign-up-form/): Discover two free plugins for enhanced form security: Mailster Cool Captcha and Mailster reCaptcha™. Both are available on the WordPress... - [How can I setup the newsletter homepage (legacy)?](https://kb.mailster.co/how-can-i-setup-the-newsletter-homepage-legacy/): Mailster requires a static newsletter homepage for subscription management. This page, accessible at http://yourdomain. tld/newsletter-signup, utilizes essential shortcodes for signups,... - [SMTP Error: Could not authenticate](https://kb.mailster.co/smtp-error-could-not-authenticate/): Campaigns may pause or fail to send emails due to SMTP authentication errors, incorrect credentials, or blocked ports. Ensure you’re... - [Can I add attachments to my newsletter?](https://kb.mailster.co/can-i-add-attachments-to-my-newsletter/): Enhance your campaigns by adding attachments via the campaign edit screen, with a total size limit of 1MB (modifiable to... - [Why I can't save templates or other files?](https://kb.mailster.co/why-i-cant-save-templates-or-other-files/): Troubleshooting issues with saving templates in WordPress plugins like Mailster can be frustrating. Common causes include permission errors, plugin conflicts,... - [Why do I get this parse error?](https://kb.mailster.co/why-do-i-get-this-parse-error/): Mailster may display a "parsererror 200" when an Ajax request fails to return valid JSON, often due to third-party plugins... - [How can I open the browsers console?](https://kb.mailster.co/how-can-i-open-the-browsers-console/): The Browser Console is essential for tracking JavaScript errors and server-related information. Access it in Chrome (CTRL + SHIFT +... - [Why I'm not able to connect to bounce server?](https://kb.mailster.co/why-im-not-able-to-connect-to-bounce-server/): To set up a bounce server, use port 110 or 995 for SSL connections. If you encounter an "Unable to... - [Why can't I use SMTP?](https://kb.mailster.co/why-cant-i-use-smtp/): SMTP (Simple Mail Transfer Protocol) utilizes various ports (25, 993, 465, 587) for email sending, but providers may block specific... - [Mailster is not able to access the file system](https://kb.mailster.co/mailster-is-not-able-to-access-the-file-system/): To resolve Mailster's file system writing issues, adjust your WordPress file permissions or add `define('FS_METHOD', 'direct');` in your wp-config. php.... - [How can I setup a cron job?](https://kb.mailster.co/how-can-i-setup-a-cron-job/): Ensure your email campaigns are sent correctly by properly setting up your cron. You can use WP-cron for automatic scheduling... - [What are my sending limits?](https://kb.mailster.co/what-are-my-sending-limits/): Mailster allows you to customize email sending rates to comply with your provider's limits, typically 1-2 emails per second. Customers... - [My provider doesn't allow sending bulk mails](https://kb.mailster.co/my-provider-doesnt-allow-sending-bulk-mails/): Your provider restricts bulk and outgoing mail. Consider using dedicated email services like SendGrid, Mandrill, Amazon SES, or SparkPost. If... - [How can I update to the latest version?](https://kb.mailster.co/how-can-i-update-to-the-latest-version/): To update Mailster, visit your WordPress Updates page or enable automatic updates in settings. You can also update via your... - [How can I increase my memory limit?](https://kb.mailster.co/how-can-i-increase-my-memory-limit/): Encountering the "Allowed memory size exhausted" error in WordPress indicates the need to increase your PHP memory limit. This guide... - [The latest cronjob hasn't been finished](https://kb.mailster.co/the-latest-cronjob-hasnt-been-finished/): Email delays may lead to server timeouts and inaccurate statistics. If you receive a notification, it could be temporary and... - [What is the CAN-SPAM act and do my newsletters have to comply?](https://kb.mailster.co/what-is-the-can-spam-act-and-do-my-newsletters-have-to-comply/): The CAN-SPAM Act of 2003, signed by President Bush, established national standards for commercial email in the U. S. It... - [How can I prevent that my campaigns went in spam folder?](https://kb.mailster.co/how-can-i-prevent-that-my-campaigns-went-in-spam-folder/): To avoid spam filters in email campaigns, conduct a spam score test, use a dedicated Email Service Provider (ESP), and... - [Mailster doesn't work with [third party plugin]](https://kb.mailster.co/mailster-doesnt-work-with-a-third-party-plugin/): Mailster aims for compatibility with popular plugins by adhering to WordPress Coding Standards. If issues arise, follow our debugging guide:... - [How can I customize the notification template?](https://kb.mailster.co/how-can-i-customize-the-notification-template/): Mailster allows you to customize notification emails using the campaign editor. Create a new campaign, select the notification template, and... - [How do I export my subscribers?](https://kb.mailster.co/how-do-i-export-my-subscribers/): Easily export your subscribers from the "Manage Subscribers" page by selecting the "Export" tab. Choose your lists, set conditions, and... - [Why are my auto responders not getting send?](https://kb.mailster.co/why-are-my-auto-responders-not-getting-send/): Setting up a custom autoresponder can be challenging. If you're facing issues, check that your campaigns are active, emails can... - [Changelog](https://kb.mailster.co/changelog/): Version 4. 1. 10 enhances the capabilities and permissions system, improves error handling in form blocks, and refines homepage editing... - [Why my campaigns do not get sent?](https://kb.mailster.co/why-my-campaigns-do-not-get-sent/): If your email campaign isn't sending, check key settings: verify newsletter delivery and cron job functionality, ensure server resources are... - [Why I get a "Could not execute:/usr/sbin/sendmail" error message?](https://kb.mailster.co/why-i-get-a-could-not-execute-usr-sbin-sendmail-error-message/): Sendmail is a widely used mail transfer client, but ensure the path "/usr/sbin/sendmail" is correct and you have permission to... - [Where's my purchase code?](https://kb.mailster.co/where-is-my-purchasecode/): To find your Mailster Newsletter Plugin license code from the Envato Marketplace, log in, go to "Downloads," select the plugin,... --- # # Detailed Content ## Posts ### Time-Based Sending - Published: 2025-04-01 - Modified: 2025-04-01 - URL: https://kb.mailster.co/time-based-sending/ - Categories: Settings Mailster's Time Frame settings allow you to control when email campaigns and autoresponders are sent, enhancing engagement and respecting recipients' schedules. Customize sending days, times, and time zones to optimize delivery, while ensuring transactional emails are sent immediately, regardless of these settings. The Time Frame settings in Mailster allow you to define specific days and times when your email campaigns and autoresponders are allowed to send. This feature helps you prevent messages from being delivered at unwanted times, improving engagement and respecting your recipients' schedules. (more... ) --- ### Shortcodes - Published: 2025-03-31 - Modified: 2025-04-03 - URL: https://kb.mailster.co/shortcodes/ - Categories: Documentation - Tags: shortcodes Mailster offers five handy shortcodes for easy newsletter integration. Use to embed campaigns, for recent newsletters, and for sign-up forms. You can also check subscriber counts with . Note that some codes, like and , are now deprecated. Mailster supports five built-in shortcodes you can use. You can use them anywhere where shortcodes are accepted. Embeds a newsletter campaign as an iframe. AttributeDefaultOptionidnullThe ID of the campaignscrollingtruesets the scrolling of the iframe Example Displays a list of links to your latest newsletters. AttributeDefaultOptiondatefalseDisplay date next to the linkcount10Number of list itemsstatus(array)( 'finished', 'active' )Status of campaignsorder'desc'Order direction ('asc' or 'desc')orderby'date'Order by value Example Displays a newsletter sign-up form (block form) with a certain ID. AttributeDefaultOptionidnullThe ID of the form. Example (deprecated) Deprecated! Use instead. Displays a newsletter sign-up form with a certain ID. AttributeDefaultOptionidnullThe ID of the form. Example Displays the number of your subscribers. AttributeDefaultOptionformattedtrueformats the number with number_format_i18nround1Round up to the next X value (eg. 10, 100, 1000, etc. )listsnullDisplay count from a certain list Example Counting the number of subscribers can be time-consuming if you have many. Consider page caching to prevent slow responses on your site. (deprecated) Displays a Subscriber Button. AttributeDefaultOptionidnullThe ID of the form. showcountfalseDisplay the number of your subscribers. labelContent from TextsThe label of the button,design'default'Currently supported style: 'default', 'wp', 'twitter', 'flat', 'minimal'width480Width of the popup Example --- ### Widgets - Published: 2025-03-31 - Modified: 2025-03-31 - URL: https://kb.mailster.co/widgets/ - Categories: Documentation - Tags: widgets Mailster offers four handy widgets for your WordPress site, found under the Appearance menu. You can add a signup form, display your latest newsletters, show your subscriber count, or include a subscriber button, all with customizable text options before and after. Mailster has four built-in widgets you can use. Find them in the Appearance menu of your WordPress site. If your site uses a Block theme or Full site editing, you can still use these widgets but may find better support for dedicated blocks. Signup Widget Embed your signup forms everywhere where widgets are accepted. You can choose the form and the title of the widget. If you like, you can display additional text before and after the widget. Latest Newsletter Display the latest newsletters as a list. Mailster will use the latest regular campaigns, which are either queued, active, or finished. Subscriber Count Display the number of subscribers in your sidebar. Use the Prefix to add text before and the Postfix field to add text after the number. You can also round up to the next even number. Display a Subscriber Button Read more about subscriber buttons here. Use the Prefix to add text before and the Postfix field to add text after the button. --- ### Preheaders - Published: 2025-03-31 - Modified: 2025-03-31 - URL: https://kb.mailster.co/preheaders/ - Categories: Documentation, Campaigns - Tags: preheader Preheaders are short phrases that boost your email's click-through rate by appearing in the preview pane of some email clients. In Mailster, you can customize preheaders for each campaign, even adding emojis. Check out handy guides to make the most of your preview text! Preheaders are small phrases (up to 80 characters) that should help increase your click-through rate. Many email clients display the first letters of an email in their preview area. Preheaders are invisible in the normal email view and show up only in the preview pane of some clients. Preheaders in Mailster Mailster allows you to define the preheader of your campaign in the details meta box. You can use emojis here as well. You can change the preheader for each campaign. Useful resources The Ultimate Guide to Preview Text Support The Little-Known Preview Text Hack You May Want to Use in Every Email Tips for Coding Email Preheaders --- ### Notifications Template - Published: 2025-03-31 - Modified: 2025-03-31 - URL: https://kb.mailster.co/notifications-template/ - Categories: Campaigns, Documentation Mailster can send transactional emails using a special template. Starting from version 4.0, it uses a base template, typically notification.html. This template needs two tags: {headline} for the subject and {content} for the email body, allowing you to manage outgoing emails from your WordPress site. Mailster can also send transactional emails, which are not part of a campaign. For these emails a special Template file is used. Since Mailster 4. 0, newer templates do not have this template anymore but instead are built from the base template. By default, it is the notification. html template file in your template folder, but it can be any file that contains at least two tags: {headline} (for the headline or subject) {content} (for the actual content of the email) This file is used by Mailster to send Double Opt In Confirmation Notification about new users You can also send all outgoing mails from your WordPress site with this template. Mailster can wrap the template around the content. --- ### Auto responder - Published: 2025-03-31 - Modified: 2025-03-31 - URL: https://kb.mailster.co/auto-responder/ - Categories: Campaigns, Documentation - Tags: autoresponder Mailster's auto-responder feature automates your email marketing with six types, including subscriber-based, action-based, and time-based options. It lets you send targeted campaigns after specific events or time intervals, making it easier to engage with your audience. Test it out on our demo! Auto-responder in Mailster helps you to automate your email marketing. Autoresponders have been replaced by email automation, so it’s best to use email automation instead. Test this page on our demo. With auto responders you can send campaigns to subscribers after a specific time and after a certain event. There are six types of auto responders available: Subscriber-based auto-responder Action-based auto-responder Time-based auto-responder User time-based auto-responder Follow-up auto-responder Action Hook-based auto-responder Subscriber-based Autoresponder They are made to send messages to users on a specific action. These actions can be subscription unsubscription Read more about this type here. Action-based Autoresponder For automated campaigns when new content has been published. Read more about this type here. Time based Autoreponder For automated campaigns in a specific time interval. Read more about this type here. Action Hook-based Autoreponder For campaigns triggered by custom actions from either third-party plugins or via custom coding. Read more about this type here. Follow-up auto-responder For sending follow up emails and drip campaigns after certain actions. Read more on our here. Prepare your Autoresponder This is how your auto-responder campaign can look: --- ### Custom Fields - Published: 2025-03-31 - Modified: 2025-03-31 - URL: https://kb.mailster.co/custom-fields/ - Categories: Documentation, Subscribers With custom fields in Mailster, you can enhance subscriber info beyond the basics like email and name. Add details like gender, company, or social media handles. Easily create new fields on the settings page and use them in your campaigns with simple tags. With custom fields you can add additional information to your subscribers. By default, Mailster stores the following info of your subscribers (if provided): Email address (required) Firstname Lastname Signup Date Confirmation Date * IP Address * * depends on your settings. Other custom data like Gender, Company Name, Telephone number, Twitter handle, etc. must be stored in custom fields. Create custom fields You can create new custom fields on the settings page. Create new custom fields on the settings page. FieldInfoField NameThe name of the fieldTagThe tag for this field. Can be used in campaings with {custom-field}. Allowed characters: `a-z0-9_-TypeThe tag for this field. Can be used in campaigns with {custom-field}. Allowed characters: `a-z0-9_- --- ### Subscriber Detail - Published: 2025-03-31 - Modified: 2025-03-31 - URL: https://kb.mailster.co/subscriber-detail/ - Categories: Documentation, Subscribers Each subscriber has a detailed page with their email, name, status, subscription info, GDPR consent, custom fields, and more. You’ll also see their location, timezone, email clients used, activity stats like opens and clicks, and total campaigns sent. Check out the demo to see it in action! For each subscriber, you get a detailed page with more information. Test this page on our demo. On this page, you find the following information: Email address Name * Status Subscription-related info * GDPR consent given timestamp * Custom fields * List assignments User Avatar * Geo location * Timezone and Local time * Used Email Clients * Activity including opens and clicks. * Total number of sent campaigns. Open, click, and adjusted click rate. * * if available --- ### Security Settings - Published: 2025-03-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/security-settings/ - Categories: Settings - Tags: security Mailster's Security Settings enhance campaign protection by validating emails, blocking spam, and preventing duplicate signups. Key features include MX record checks, SMTP validation, honeypots for bots, antiflood controls, and options to block disposable emails, specific addresses, domains, IPs, and countries while allowing safe domains. The Security Settings in Mailster allow you to safeguard your campaigns and signups by adding various layers of protection. Below is an overview of the available options and how to configure them. General Checks General checks help validate and verify email addresses and domains before allowing them to sign up. Check MX Record: Verifies that the domain has an existing MX record, which is essential for delivering emails. If no MX record is found, it indicates that the domain has no configured mail server. Validate via SMTP: Connects to the SMTP server of the domain to confirm that the email address actually exists. This reduces the risk of using fake or invalid addresses. Honeypot: Adds an invisible input field to catch bots trying to fill out all fields during signup. IP Check: Prevents a signup from the same IP address if there is already a pending subscriber from that IP. This is useful for reducing spam and duplicate signups. Antiflood Sets a time limit to prevent repeated subscriptions from the same IP address within a specified period. If set to 10 seconds, users cannot subscribe multiple times from the same IP within 10 seconds. Auto Click Prevention This option adds an extra redirect when links in emails are clicked too quickly. Some automated email security systems might click on every link to test them, which could skew campaign metrics. Enabling this option helps reduce false clicks. Read more here. Disposable Email Provider Rejects email addresses from temporary or disposable email... --- ### Do Not Track (DNT) - Published: 2025-03-24 - Modified: 2025-03-31 - URL: https://kb.mailster.co/do-not-track-dnt/ - Categories: Tips - Tags: privacy The Do Not Track (DNT) mechanism allows users to signal their preference against online tracking via a browser setting. Despite its introduction in 2010, DNT lacks enforcement, as websites are not legally required to comply. Consequently, many ignore the signal, diminishing its efficacy amidst stronger privacy measures. The Do Not Track (DNT) mechanism is a privacy feature that allows internet users to indicate to websites and online services that they do not want their online activities to be tracked. DNT was designed to give users greater control over their personal information and browsing habits. (more... ) --- ### Mail App Unsubscribe - Published: 2025-03-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/mail-app-unsubscribe/ - Categories: Settings - Tags: deliverability Mailster includes a List Unsubscribe Header in newsletter campaigns, facilitating easy opt-outs through mailto or URL links. This feature enhances user experience, boosts email deliverability, and ensures compliance with anti-spam regulations. Major email clients like Gmail and Apple Mail support this header, providing clear unsubscribe options for recipients. Whenever you send a newsletter campaign with Mailster, it will contain a List Unsubscribe Header. This is a mandatory header for bulk mailers to make unsubscribing from your emails a standard process. You can modify the exact behavior in the settings. (more... ) --- ### Capablities in Mailster - Published: 2025-03-19 - Modified: 2025-04-03 - URL: https://kb.mailster.co/capablities-in-mailster/ - Categories: Settings Mailster empowers WordPress users by providing customizable role-based access to manage campaigns, subscribers, and templates. With default roles like Administrator and Editor, you can define specific capabilities using plugins like "User Role Editor." This ensures control over who can create, edit, or send campaigns efficiently. Mailster offers a huge set of capabilities you can use to limit the access to your WordPress users. This is useful if you like to have one person create your campaigns but prevent them from actually sending them. (more... ) --- ### How to change ownership of a license? - Published: 2025-01-16 - Modified: 2025-03-31 - URL: https://kb.mailster.co/how-to-change-ownership-of-a-license/ - Categories: Troubleshoot - Tags: license Easily transfer your Mailster license via the WordPress dashboard by navigating to "Newsletter" > "Account," editing the email address, and confirming the new owner's details. Alternatively, manage licenses directly from your Mailster account without WordPress access. From Your WordPress Dashboard You can change your license from the WordPress dashboard. Go to "Newsletter => "Account" in your WordPress Backend. Click on "Edit" next to the email address Enter the new owner's email address Once you enter the new email address, you will be asked if this is your, or your client's email address. Choose an option and continue with "Update" to move the license to a new owner. The previous owner will get a confirmation message to confirm the change of ownership. From your Mailster account In your account, you can handle the license management without access to the WordPress backend. Learn how to manage your licenses for Mailster. --- ### Email Automation Trigger: Tag removed - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-tag-removed/ - Categories: Automation - Tags: trigger - Post series: Trigger This trigger kicks off a workflow whenever a tag is removed from a subscriber. You can also set it to run when a tag is added. It works regardless of who makes the change, as long as the lists match. Choose any tags to start the workflow! This trigger starts a workflow whenever a tag is removed from a subscriber. You can also run a workflow whenever a tag is added to a subscriber. (more... ) --- ### Email Automation Trigger: Subscriber removed to a list  - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-subscriber-removed-to-a-list/ - Categories: Automation - Tags: trigger - Post series: Trigger This trigger kicks off a workflow anytime a subscriber is removed from a list. You can also set it up to start when someone is added. Just select the lists you want to monitor, and the workflow will activate whenever there's a match. This trigger starts a workflow whenever a subscriber is removed from a list. You can also run a workflow whenever a subscriber gets added to a list. (more... ) --- ### Email Automation Trigger: Subscriber added to a list - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-subscriber-added-to-a-list/ - Categories: Automation - Tags: trigger - Post series: Trigger This trigger kicks off a workflow whenever a subscriber is added or removed from a list, no matter who did it. It’s like the Form Conversion Trigger but without needing a form. Just select the lists you want to activate the workflow for. This trigger starts a workflow whenever a subscriber is added to a list. You can also run a workflow whenever a subscriber gets removed from a list. (more... ) --- ### Email Automation Trigger: Tag added - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-tag-added/ - Categories: Automation - Tags: trigger - Post series: Trigger This trigger kicks off a workflow whenever a tag is added or removed from a subscriber, no matter who made the change. You can select multiple tags to activate the workflow whenever they are assigned. This trigger starts a workflow whenever a tag is assigned to a subscriber. You can also run a workflow whenever a tag is removed from a subscriber. (more... ) --- ### Email Automation Trigger: Field updated - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-field-updated/ - Categories: Automation - Tags: trigger - Post series: Trigger This trigger kicks off a workflow when a specific subscriber field is added or updated. You can set which field to watch for changes, and updates can be made by either the subscribers themselves or anyone with the right permissions. This trigger starts a workflow if a specific field from a subscriber is added or updated. (more... ) --- ### Email Automation Trigger: Form Conversion - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-form-conversion/ - Categories: Automation - Tags: trigger - Post series: Trigger This trigger kicks off a workflow when a user signs up and confirms their subscription through a chosen form. If double-opt-in is off, it activates right after the form is submitted. Just pick at least one form or select "Any Form" to use it! This trigger will start a workflow if a user signs up through a specific form and confirms the subscription. (more... ) --- ### Email Automation Trigger: Click a link - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-click-a-link/ - Categories: Automation - Tags: trigger - Post series: Trigger Set up a workflow that activates when specific links are clicked in your campaigns. You can track both internal and external links, just remember to enter the full URLs. Make sure the links are part of your campaign to trigger the desired action! Triggers a workflow when a defined link is clicked in one of your campaigns. (more... ) --- ### Email Automation Trigger: Visits a page - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-visits-a-page/ - Categories: Automation - Tags: trigger - Post series: Trigger You can set up workflows to trigger when subscribers visit specific pages on your website. To qualify, they must have clicked a link in your campaign or signed up for your newsletter. Logged-in WordPress users with linked subscribers also trigger the workflow. You can trigger workflows if subscribers visit a certain page on your website. (more... ) --- ### Email Automation Trigger: Custom Hook - Published: 2025-01-11 - Modified: 2025-04-03 - URL: https://kb.mailster.co/email-automation-trigger-custom-hook/ - Categories: Automation - Tags: trigger - Post series: Trigger You can run a workflow with custom PHP code by using "Custom Hook" as your trigger. Define the hook's name, and use it to target specific subscribers or all of them. Just add the PHP code to a plugin or your theme's functions.php for easy integration. Run a workflow with custom PHP code. This is useful if you like to extend your custom applications with an action. (more... ) --- ### Email Automation Trigger: Anniversary - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-anniversary/ - Categories: Automation - Tags: trigger - Post series: Trigger Celebrate your subscribers' special moments with anniversary workflows! Use specific dates for all subscribers or custom field dates for personalized events like birthdays. You can set up reminders with offsets to send emails before or after the date. Keep it simple for maximum impact! Run a workflow on the anniversary of your subscribers, like birthdays or membership dates. If you would like to start a workflow on a specific date (and not on the anniversary of that date) check the Specific date Trigger. (more... ) --- ### Email Automation Trigger: Specific date - Published: 2025-01-11 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-trigger-specific-date/ - Categories: Automation - Tags: trigger - Post series: Trigger This trigger launches a workflow on a set date, perfect for sending birthday or anniversary messages. You can use specific dates for all subscribers or custom field dates for individual emails. Plus, adjust the timing with an offset to send messages earlier or later. This trigger starts a workflow on a specific date. If you like to send anniversary messages for birthdays check out the Anniversary Trigger. (more... ) --- ### Upgrading Your License - Published: 2024-09-02 - Modified: 2025-04-02 - URL: https://kb.mailster.co/upgrading-your-license/ - Categories: Tips - Tags: license With Mailster, you can easily switch or upgrade your plan anytime. Simply access the "Account" page in the WordPress Dashboard or log into your Mailster account to manage your license options. Note: The change option is unavailable if sensitive info is hidden on your site. With Mailster you always have the option to switch to a different plan or upgrade your license to more sites at any time. From within the plugin To up or downgrade your license from your WordPress Dashboard, click the "Account" page in the Newsletter menu and find the "Change Plan" button. This option is unavailable if you hide sensitive info on your site. From your account page Go to your Mailster account page and log in with your email address. Go to "Licenses" and click on the license you like to upgrade. Find the option to either up or downgrade your license to a new plan or a different amount of sites. --- ### Missing or wrong Translations - Published: 2024-08-07 - Modified: 2025-04-02 - URL: https://kb.mailster.co/missing-or-wrong-translations/ - Categories: General - Tags: language, translate, translation Mailster supports over 20 languages, featuring 3,500 strings. To help maintain accurate translations, join our Translator Program and receive a free Professional subscription by assisting in updating your preferred language. Spot a mistake? Sign up today! Mailster is available in over 20 languages, and we do our best to keep these languages up to date. Since Mailster comes with over 3,500 strings or over 16,000 words it's hard to have them correct all the time. If you spot a wrong translation or a missing string, you can sign up for our Translator Program and get a free Professional as long as you help keep the translation in your desired language up to date. Join the Translator Program --- ### Inspect the Queue of your Workflow Step - Published: 2024-08-05 - Modified: 2025-04-02 - URL: https://kb.mailster.co/inspect-the-queue-of-your-workflow-step/ - Categories: Automation - Tags: automation, queue In Mailster, steps typically process in sequence, but certain actions like Delay or Email may require queuing subscribers. The current subscriber count is displayed, and clicking it opens the Queue Inspector. Users can choose to Finish, Forward, or Remove subscribers from the queue, managing workflow efficiently. Usually, steps are processed in a single process but some steps need to delay this. This is obvious for steps like Delay or Email, but Mailster may queue subscribers on other steps as well. (more... ) --- ### Email Automation: Notification - Published: 2024-05-02 - Modified: 2025-04-02 - URL: https://kb.mailster.co/email-automation-notification/ - Categories: Automation - Tags: automation - Post series: Automations Set up email notifications in your workflow by adding a Notification step. Enter the recipient's email, define a subject, and compose a message using placeholder tags for personalization. Be cautious, as multiple notifications may flood your inbox, but each will include a link for easy access to adjustments. Sometimes it's necessary to get notified if a certain point in your workflow is reached. You can send a notification via email to any email address in this step. (more... ) --- ### Email Automation: Jumper - Published: 2024-05-02 - Modified: 2025-04-02 - URL: https://kb.mailster.co/email-automation-jumper/ - Categories: Automation - Tags: automation - Post series: Automations Jumpers streamline your workflow by allowing you to skip steps or navigate to specific points in the customer journey. Easily set up a Jumper in the Inserter, select the desired step to jump to, and define any conditions for when the jump occurs. Sometimes you need a way to skip a step or jump to a different point in your workflow. This is what jumpers are made for. They offer an easy way to jump to a different position in your customer journey. (more... ) --- ### How to manage your licenses for Mailster - Published: 2024-01-28 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-to-manage-your-licenses-for-mailster/ - Categories: Tips, Troubleshoot - Tags: freemius, license Freemius uses license keys for product access, ensuring support and automatic updates. After purchase, you'll receive an email with your license key, and you can also find it on the Mailster Account page. Without a license, plugins can be used but won't receive updates or support. The licensing system of Freemius operates on license keys allocated to each product acquired via the platform. When a license key is activated on a site, it provides access to support services and automatic updates for that site. Where to find the license keys? After finalizing an order, you will receive an email from Freemius with details about your purchased products. This email will also contain the license key for the product. Below is an excerpt from a sample email that illustrates the license key: Additionally, you can locate your license keys by visiting the Account page on the Mailster website. Once logged in, navigate to the Licenses section. There, you'll find a list of licenses associated with your account. For example: Where is my license? The Freemius licensing system is designed for user convenience, making it easy to locate your licenses. However, if you're unable to find the information you need, please don't hesitate to contact us. We're here to help and would be delighted to assist you. License keys are essential for receiving automatic updates for plugins and accessing Aelia's support services. If you plan to install a plugin on an alternate site, such as for testing purposes, you can easily upload and activate it there. The plugin will operate even without a license key. However, it's important to note that sites without an active license will not be eligible for support or automatic updates. --- ### Email Health Check - Published: 2024-01-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/email-health-check/ - Categories: Troubleshoot, Tips - Tags: precheck, spam Gmail and Yahoo will enforce new sender authentication policies from February 1, 2024, targeting bulk senders—those emailing over 5,000 recipients daily. To combat spam, they require SPF, DKIM, and DMARC compliance, easy unsubscription options, and a spam complaint rate below 0.3%. Non-compliance may result in emails being marked as spam. Gmail and Yahoo announced updates to its sender authentication policies, effective February 1, 2024. These changes aim to reduce spam by requiring bulk senders to authenticate emails, support easy unsubscription, and maintain a spam complaint rate under 0. 3%. Bulk senders are defined as those sending to 5,000 or more Gmail recipients per day. The updates include the use of SPF, DKIM, and DMARC email authentication. Additionally, Google advises supporting one-click unsubscribes through specific message headers. Failure to comply with these requirements may lead to emails being marked as spam or not delivered as expected​​. (more... ) --- ### Using Custom Modules - Published: 2023-11-16 - Modified: 2025-04-02 - URL: https://kb.mailster.co/custom-modules/ - Categories: Customization - Tags: modules Modules are customizable sections in your newsletter templates, allowing you to drag and drop various blocks to design your emails. Create custom modules by modifying existing ones, saving them for future use. Easily delete any unwanted custom modules through the module selector. Modules are segmented sections within your newsletter campaign. Every template is equipped with a range of modules that you can utilize in your emails. These modules can also be referred to as "blocks," similar to those found in the block editor. (more... ) --- ### Send your Newsletters via MailJet - Published: 2023-11-10 - Modified: 2025-04-03 - URL: https://kb.mailster.co/send-your-newsletters-via-mailjet/ - Categories: Tutorial, Extensions, General - Tags: mailjet Mailjet is an efficient email marketing tool that integrates with Mailster, offering robust bounce handling support. To get started, create an account, verify your domain, configure SPF/DKIM for spam protection, set up webhooks for bounce management, and send a test email to ensure everything works smoothly. Mailjet is a highly efficient email marketing tool that seamlessly integrates with Mailster. Notably, it offers exceptional support for bounce handling straight from the get-go. (more... ) --- ### Convert your Legacy Forms - Published: 2023-09-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/convert-your-legacy-forms/ - Categories: Tips - Tags: forms Mailster 4.0 introduces a new form builder based on the WordPress block editor, requiring users to convert existing legacy forms. Legacy forms will remain functional but won't receive updates. Users can convert forms via the "Convert to Block Form" link and may need to adjust custom CSS. Shortcodes are available for unsupported blocks. Mailster 4. 0 introduces a new way to create forms. The new builder is based on the WordPress block editor, and your forms created with Mailster before 4. 0 need to be converted. (more... ) --- ### Email Automation: Email - Published: 2023-05-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/email-automation-email/ - Categories: Automation - Tags: automation - Post series: Automations At this stage, an email is sent to subscribers, allowing for campaign customization and tracking. Ensure a reasonable delay between emails and use conditions for targeted sending. Configure your cron settings accurately, and manage campaigns within the workflow for efficient email dispatch. An email is sent to the subscriber at this stage. (more... ) --- ### Email Automation: Delay - Published: 2023-05-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/email-automation-delay/ - Categories: Automation - Tags: automation - Post series: Automations Incorporating a delay step in your workflow introduces a strategic pause, allowing for better timing of subsequent actions. Options include delaying by a specific duration or until a designated time, ensuring flexibility in workflow management. If the specified time is missed, the next available timeframe will be utilized. Incorporating a delay step entails introducing a brief pause into your workflow. (more... ) --- ### Email Automation: Actions - Published: 2023-05-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/email-automation-actions/ - Categories: Automation - Tags: automation - Post series: Automations Mailster's actions enhance your email automation workflow by allowing you to update custom fields, manage subscriber lists, add or remove tags, unsubscribe users, and send data to third-party URLs. Each action can trigger additional workflows for streamlined communication and management. Actions let you do something at a certain point in your workflow. They are useful if you like to do things (except send emails) in your email automation. (more... ) --- ### Email Automation: Triggers - Published: 2023-05-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/email-automation-triggers/ - Categories: Automation - Tags: automation - Post series: Automations Mailster's email marketing automation allows you to create workflows initiated by triggers. With up to five available triggers—like subscriber additions, tag updates, and link clicks—you can customize your campaigns. Conditions ensure targeted delivery, and workflows can repeat based on your defined limits, enhancing engagement without spamming. Triggers let you define how to start a workflow for your email marketing automation. (more... ) --- ### Email Automation in WordPress - Published: 2023-05-14 - Modified: 2025-04-01 - URL: https://kb.mailster.co/email-automation-in-wordpress/ - Categories: Getting Started, Automation, Tutorial - Tags: automation - Post series: Automations Mailster automates email marketing, enhancing communication and customer engagement through customizable workflows. Key components include triggers and actions, allowing for personalized messaging, delays for timing, and conditions to tailor paths. Users can easily create workflows, manage email statistics, and add comments for clarity. With Mailster, you get a powerful way to automate your email marketing. Email marketing automation can help businesses streamline communication, personalize messaging, and improve customer engagement through automated workflows and targeted campaigns. (more... ) --- ### How can I setup the newsletter homepage? - Published: 2023-05-04 - Modified: 2025-04-01 - URL: https://kb.mailster.co/how-can-i-setup-the-newsletter-homepage/ - Categories: General, Getting Started To set up your newsletter with Mailster, create a static homepage to manage subscriptions. This page, called "Newsletter," is auto-generated during setup. You can customize sections for signing up, updating profiles, and unsubscribing. Adjust settings easily in WordPress to fit your needs. To ensure the smooth functioning of the subscription and unsubscription process, it is imperative to have a static page as your newsletter homepage. When activating Mailster, you will be prompted to create this page as part of the setup process. (more... ) --- ### Convert your Newsletter Homepage - Published: 2023-05-04 - Modified: 2025-04-02 - URL: https://kb.mailster.co/convert-your-newsletter-homepage/ - Categories: Tutorial - Tags: block forms, forms Upgrade your newsletter homepage by migrating from shortcodes to new block forms. Remove outdated shortcodes (, , ) and add the Mailster Newsletter Block. For detailed steps, visit our guide. Don't miss the chance to modernize your communication! It is high time to upgrade to the new block forms if you are still using shortcodes on your old newsletter homepage. This guide can help you migrate to the updated version. (more... ) --- ### Update Billing Details and Access Invoices - Published: 2023-04-13 - Modified: 2025-04-02 - URL: https://kb.mailster.co/update-billing-details-and-access-invoices/ - Categories: General Updating your Freemius billing information is easy! Log in to your account at https://mailster.co/account, go to My Profile, and enter your new details. Changes will reflect on future invoices. You can also download past invoices from the Orders History tab. If you need to update or add billing information for your entire Freemius account, it's super easy to do so. You can actually handle it all yourself right from your profile! Log in to your account at https://mailster. co/account using the email address you used when you purchased the plugin. Once you're logged in, navigate to the My Profile section. Fill in all the necessary information for your updated billing details. Your changes will be reflected on all past invoices in your order history. Please note that adding a VAT number won't affect any already charged VAT. The change will only apply to future invoices. Mailster user account dashboard Invoices When you purchase or renew your subscription, you'll receive an invoice email from Freemius on our behalf. If you're having trouble locating this email, don't worry - you can easily download all your previous invoices from your account. To do so, simply login to your account using your login details. If you can't remember your password, don't fret - you can follow the prompts to reset it. Once you've logged in successfully, navigate to the Orders History tab. From there, you can download an invoice for each payment by clicking on the blue invoice symbol labeled "Invoice". Order History --- ### Change the length of the excerpt - Published: 2023-03-21 - Modified: 2025-04-03 - URL: https://kb.mailster.co/change-the-length-of-the-excerpt/ - Categories: Tutorial - Tags: filters WordPress allows customization of excerpt length through the excerpt_length filter. Mailster offers a similar feature using the mailster_excerpt_length filter, enabling you to set a specific length for excerpts in email campaigns. For example, use code to set the excerpt length to 20 words. WordPress has a filter to change the length of the excerpt on your website. The excerpt_length filter helps you to do this. Mailster has a dedicated filter you can use to change the length of excerpts in your email campaigns. (more... ) --- ### Why does my Legacy license expire? - Published: 2023-03-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-does-my-legacy-license-expire/ - Categories: Troubleshoot - Tags: license If you purchased an Envato license after October 1, 2022, it will expire in five months, halting automatic updates via WordPress. You can either upgrade your license for future updates or download the latest version from your Envato account. Your license remains valid for life per Envato's terms. If you bought a license from Envato after the 1st of October 2022 you see an "Expires in... " badge on your account page. Legacy Licenses will expire in 5 month This means you will no longer get automatic updates via your WordPress dashboard once the license has expired. Your Envato License is still a lifetime license, following the Terms and Conditions from Envato. You have two options: Upgrade your license Click on "Change Plan" to upgrade your license to get future updates. Download a copy from Envato Go to your Envato downloads page and download a copy of the latest version from Mailster. --- ### How can I upgrade my license? - Published: 2023-03-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-upgrade-my-license/ - Categories: Tips - Tags: license Upgrade your license directly from the plugin by navigating to Newsletter => Account and clicking "Change Plan." Enter your license key if white-labeled, then input payment details. Optionally, add another license and enter a VAT ID if applicable. Review your order and click "Pay & Subscribe" to complete the process. You can upgrade your license directly from the plugin if you go to Newsletter => Account and click on the "Change Plan" button: Change your current plan If you have white-labeled your license, you have to insert your license key first. On the following page, you can upgrade your license by inserting your payment details. Optionally, you can choose to get another license as well. If you have a VAT ID, you should enter it by clicking on "Purchasing as a business". Once you have entered your payment details, you have to review your order. Click on "Pay & Subscribe" to complete the checkout process and get redirected back to the account page. --- ### Logging Outgoing Mails in Mailster - Published: 2023-03-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/logging-outgoing-mails-in-mailster/ - Categories: Features - Tags: logging Mailster allows you to log outgoing emails in WordPress. Enable logging in the Newsletter settings, define entry limits, and access detailed logs of sent emails, including recipient information and campaign details. Ensure privacy by limiting logging duration and restricting access to authorized users only. With Mailster you can log outgoing emails in WordPress. Head over to Newsletter => Settings to find the "Logging" tab. (more... ) --- ### Licensing Information - Published: 2023-03-14 - Modified: 2025-04-02 - URL: https://kb.mailster.co/licensing-information/ - Categories: General - Tags: legacy, license, purchase code You can purchase Mailster from either mailster.co or CodeCanyon. Each license is domain-specific, allowing use on unlimited subdirectories. You can change the assigned domain up to three times. Licenses bought after October 1, 2022, receive six months of auto-updates. For additional licenses, visit the purchase link. You have two ways to purchase Mailster: From mailster. co If you bought Mailster from the official website your licenses are handled by our partner Freemius. From CodeCanyon If you bought a license from CodeCanyon (an Envato Marketplace) the official license agreements are applied to your purchased license. The license is given in form of a unique key (purchase code) which will be used during registration and must be kept secret. (more... ) --- ### Static Map Service - Published: 2023-03-13 - Modified: 2025-03-31 - URL: https://kb.mailster.co/static-map-service/ - Categories: Settings - Tags: maps Mailster offers three static map options: no maps, OpenStreetMaps for privacy, or Google Maps for high-quality visuals. Adjust your preference in Settings => General. Note that Google Maps requires an API key and may have display restrictions in emails. Choose the option that best fits your needs. Mailster uses static image maps of various places like the subscriber's detail page or the new subscriber notification. Head over to Settings => General to choose which one you like to use. (more... ) --- ### Block Forms - Published: 2023-02-27 - Modified: 2025-04-02 - URL: https://kb.mailster.co/block-forms/ - Categories: Documentation - Tags: form, forms Manage your block forms easily through the "Block Forms" menu in the Newsletter section. Create new forms with templates, customize fields, and set up options like double opt-in and GDPR compliance. You can also style forms, define placements, and use pop-ups to enhance user engagement. If you click on the Block Forms menu entry, you can find an overview of your current block forms. This is the place where you can manage all your block forms. (more... ) --- ### Templates - Published: 2023-02-26 - Modified: 2025-04-02 - URL: https://kb.mailster.co/templates/ - Categories: Documentation Mailster templates shape your campaign's design, accessible under Newsletter => Templates in your WordPress Dashboard. You can upload purchased or compatible third-party templates, including those from Envato Marketplace. Simply ensure they're valid Mailster ZIP files to successfully add and start using them in your campaigns. Templates are an essential part of Mailster. They define the look and feel of your campaigns. You can find all installed templates at Newsletter => Templates. (more... ) --- ### Create Custom Templates - Published: 2023-02-26 - Modified: 2025-04-03 - URL: https://kb.mailster.co/create-custom-templates/ - Categories: Documentation, Templates A Mailster Template is a folder with essential files for creating email templates. It must include at least two files: index.html for modules and notification.html for alerts. Templates follow a specific structure, allowing customization through modules, headers, and footers, ensuring clean and effective email design. General Idea A Mailster Template is a folder containing all individual Template Files and required assets. A Mailster Template can have multiple Template Files. Structure A Mailster Template includes at least two Template Files: index. html notification. html You can add additional Template Files in this folder. While the index. html file contains all available modules, the notification. html file contains only a text area that is used for notifications (e. g. confirmation, new subscriber info, and emails used by WordPress with the wp_mail method. Each Template File must include a header, similar to the header of a WordPress Theme: NameInfoTemplate NameThe Name of your TemplateName (optional)The Name of your Template FileTemplate URI (optional)The URL of your templateDescription (optional)A short description to describe your TemplateAuthorThe name of the creatorAuthor URI (optional)The URL of the creatorVersioncurrent version numberWidth (optional)width of the template (Desktop) used for the module screenshots Each Template File is structured as follows: header modules module module ... footer The header and footer can also be inside the modules but only if a tag is wrapping the HTML. Example HTML Let's take a look at this example {subject} /* some styling here (will be inlined) */... --- ### Delete Subscribers - Published: 2023-02-26 - Modified: 2025-03-31 - URL: https://kb.mailster.co/delete-subscribers/ - Categories: Documentation, Subscribers You can easily delete subscribers in Mailster to keep your list healthy. Use the Delete Subscribers page for bulk actions, set conditions, and manage statuses. Mailster automates this process, marking inactive contacts for removal after 14 days. Regularly cleaning your list boosts engagement and reduces spam complaints. Similar to exporting subscribers you can also delete subscribers. While you can delete subscribers from the Subscribers Overview page it's faster to process large batches via this page. The Delete Subscribers overview Lists: Choose which lists you like to delete. Conditions: Apply conditions to your subscribers (Read more). Status: Choose the status of your subscribers. Remove all actions from affected users This option will remove all actions like clicks, opens, bounces unsubscribes of the selected users. Automation Mailster can keep your list clean and healthy by removing contacts based on defined conditions. Mailster will check your contacts daily and mark matching ones as "deleted". All subscribers with the status of deleted will get removed automatically after 14 days You can find the section to set up automation at the bottom of the "Delete" section at "Manage Subscribers". Common Automation Jobs To keep your lists clean it's recommended to remove old and inactive subscribers. This keeps your list healthy, reduces spam complaints, and increases open and click rates. Here are some examples you can use on your site. Remove all people who have unsubscribed from a certain list. Remove all people who bounced or caused an error after 1 month. Remove all people who have a bad rating and didn't open a campaign within the last 3 months. --- ### Finished Campaigns - Published: 2023-02-26 - Modified: 2025-04-02 - URL: https://kb.mailster.co/finished-campaigns/ - Categories: Documentation Mailster offers in-depth campaign statistics, including total recipients, click rates, device usage, and geographic location of opens. You can filter data and explore details on clicks, device types, and locations, enhancing your understanding of subscriber engagement. Note that editing is not possible once a campaign is live. Mailster provides detailed statistics about your campaigns and the subscribers who opened them. (more... ) --- ### Subscribers Overview - Published: 2023-02-26 - Modified: 2025-03-31 - URL: https://kb.mailster.co/subscribers-overview/ - Categories: Documentation, Subscribers Mailster makes it easy to manage your subscribers right in WordPress. You can view, search, and filter subscribers by status. Use search modifiers to refine results, and perform bulk actions like sending campaigns or updating statuses. Keep your subscriber list organized and efficient! Mailster allows managing all your subscribers inside your WordPress installation. They are stored in tables in the same database as the regular tables from WordPress. (more... ) --- ### Campaign Overview - Published: 2023-02-25 - Modified: 2025-04-03 - URL: https://kb.mailster.co/campaign-overview/ - Categories: Documentation The Campaign Overview page provides a snapshot of all your campaigns, displaying subscriber statuses and performance metrics. Campaigns can have various statuses like Paused, Queued, Active, Finished, Draft, and Pending. Metrics such as open rates and unsubscribe rates help assess campaign performance, with options for bulk actions to manage multiple campaigns efficiently. The Campaign Overview page gives you a quick overview of all your campaigns. It's similar to the post overview page where all. (more... ) --- ### Frontpage - Published: 2023-02-25 - Modified: 2025-04-02 - URL: https://kb.mailster.co/frontpage/ - Categories: Documentation The Frontpage displays your newsletter in a web format, featuring navigation buttons, a share option, and customizable settings. You can manage search engine visibility, enable or disable the top bar, customize homepage slugs, and create an archive of your campaigns in reverse chronological order. The Frontpage displays your newsletter as a "web version". It provides a top bar with a link to your homepage, the campaign's title, a next and previous button to display the next or previous campaign (if it exists), an optional share button, and a button to close the frame. (more... ) --- ### The Campaign Editor - Published: 2023-02-25 - Modified: 2025-04-01 - URL: https://kb.mailster.co/the-campaign-editor/ - Categories: Documentation The Mailster campaign editor simplifies campaign creation, allowing users to design campaigns and autoresponders easily. Key features include customizable titles, module-based content addition, and delivery options. Users can target specific subscriber lists and adjust tracking settings, ensuring effective email marketing tailored to their needs. The campaign editor is the heart of Mailster and allows you to quickly build your campaigns. You can also create an Autoresponder as well as Notification templates. (more... ) --- ### Campaign Precheck - Published: 2023-02-25 - Modified: 2025-04-02 - URL: https://kb.mailster.co/precheck/ - Categories: Documentation - Tags: deliverability, precheck Mailster's Precheck feature allows you to efficiently assess your campaign's deliverability. It analyzes subject lines, links, images, and provides a SpamAssassin score. Additionally, it checks authentication methods and your server's IP against over 50 blocklists, ensuring your emails reach their destination without compromising privacy. With Mailster you can quickly check your campaigns for deliverability with our precheck feature. (more... ) --- ### I have problems with sending campaigns. - Published: 2023-02-24 - Modified: 2025-04-02 - URL: https://kb.mailster.co/i-have-problems-with-sending-campaigns/ - Categories: Troubleshoot If you experience issues sending your campaigns, verify your cron setup, as it's crucial for successful delivery. Check for cron locks that may prevent duplicate emails and ensure your RSS feed URLs are accessible. For further assistance, consult our help article. If you encounter problems while sending your campaigns it's most likely a problem with your cron setup. (more... ) --- ### How to read metrics on the campaign overview page. - Published: 2023-02-22 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-to-read-metrics-on-the-campaign-overview-page/ - Categories: General The Campaign Overview page provides insights into campaign performance, highlighting key metrics. With 8,318 total receivers, the campaign achieved a 33.88% open rate (2,828 opens) and a 5.11% adjusted click-through rate (427 clicks). Unsubscribes were at 94 (1.13%), with a bounce rate of 0.36%. On the Campaign Overview page, you get an overview of how your campaigns perform. (more... ) --- ### How do I import my subscribers? - Published: 2023-02-22 - Modified: 2025-03-31 - URL: https://kb.mailster.co/how-do-i-import-my-subscribers/ - Categories: Getting Started - Tags: import Before launching your first email campaign with Mailster, import your existing subscribers on the “Manage Subscribers” page. You can upload a CSV, paste from a spreadsheet, or import WordPress users. Choose how to handle existing subscribers and set their status before finalizing the import. Before you start sending your first email campaign you may like to import your existing subscribers, into Mailster. You can import your subscribers on the “Manage Subscribers” page. Click on the “Import” tab on the top and select the lists of which subscribers you like to export. (more... ) --- ### Migrating your license to Freemius - Published: 2023-02-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/migrating-your-license-to-freemius/ - Categories: Tutorial - Tags: license To continue using Mailster after purchasing it on Envato, migrate your license to Freemius via the WordPress Dashboard. Enter your Envato purchase code and email, then click "Migrate to Freemius now." This ensures you receive updates and manage your license effectively. Don't delay migration to avoid losing access to features! If you bought Mailster on the Envato marketplace, you have to migrate your Envato License (purchase code) to a Freemius license. You can do this right from your WordPress Dashboard. (more... ) --- ### Use Advanced Custom Fields in your Newsletter Campaigns - Published: 2022-11-08 - Modified: 2025-04-02 - URL: https://kb.mailster.co/use-advanced-custom-fields-in-your-newsletter-campaigns/ - Categories: Tips, Tutorial - Tags: acf, advanced custom fields Advanced Custom Fields (ACF) enhances WordPress by allowing users to add custom fields to edit screens, streamlining website development and client education. With Mailster integration, these custom fields can be utilized in email campaigns, enabling personalized content through simple tag formatting. Advanced Custom Fields is a popular plugin that can help you add extra content fields to your WordPress edit screens. These extra content fields are more commonly referred to as Custom Fields and can allow you to build websites faster and educate your clients quicker. With Mailster you can use these fields inside your email campaigns (more... ) --- ### Trigger Custom Javascript on Form Submission - Published: 2022-10-27 - Modified: 2025-04-03 - URL: https://kb.mailster.co/trigger-custom-javascript-on-form-submission/ - Categories: General Mailster Block Forms allows you to run custom JavaScript to track form submissions via Analytics. Access the "Events" section to define your code for five event types: Impression, Open, Close, Submit, and Error. Each event provides specific context and allows you to send data to Google Analytics or Plausible. With Mailster Block Forms you can run custom JavaScript on certain actions. This helps when you like to track form submissions with your Analytics software. (more... ) --- ### Warm up your email delivery method - Published: 2021-06-09 - Modified: 2025-04-02 - URL: https://kb.mailster.co/warm-up-your-email-delivery-method/ - Categories: Tips, Settings - Tags: delivery When starting with email marketing or changing providers, avoid sending too many emails at once. Use Mailster’s Warmup settings to gradually increase your email throughput. Set a timeframe for warming up your server, allowing Mailster to adjust send rates and batch sizes over time for optimal delivery. If you just started with email marketing or switched your delivery provider or even your domain or IP address it's a good practice to not start blasting your provider with too many emails at once. (more... ) --- ### Send your emails as fast as possible - Published: 2021-06-09 - Modified: 2025-04-03 - URL: https://kb.mailster.co/send-your-emails-as-fast-as-possible/ - Categories: Tips, Settings - Tags: delivery Mailster sends emails in batches to avoid server timeouts and delivery bans. You can enable automatic batch size adjustment based on your server's capabilities. However, be cautious of your email provider's limits, as this option prevents manual size settings and may require time to optimize batch delivery. Mailster sends you emails in batches. While this is a technical limitation, it also prevents sending too many emails at once, which causes server timeouts and even gets you banned from your email delivery provider. (more... ) --- ### Prevent spam filters from automatically opening and clicking through links in your campaigns - Published: 2021-06-09 - Modified: 2025-04-02 - URL: https://kb.mailster.co/prevent-spam-filters-from-automatically-opening-and-clicking-through-links-in-your-campaigns/ - Categories: Tips, Settings - Tags: spam Email spam filters may click links in your emails, leading to false open rates and unintended unsubscribes. Mailster offers an "Auto Click Prevention" option to counter this. By redirecting link clicks through a proxy page, it ensures accurate user engagement metrics while safeguarding against bot interference. Some email spam filters can open and click through the links in your emails to check for malicious content. This can cause false open rates and may also unsubscribe users (if you have single-opt-out enabled). To prevent this Mailster has the option to prevent this behavior. (more... ) --- ### How many mails can I send at once? - Published: 2021-04-13 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-many-mails-can-i-send-at-once/ - Categories: Tutorial, Settings, Tips - Tags: delivery Optimize your email marketing by balancing throughput rate and batch size to avoid server timeouts. Determine your server's email capacity and adjust your cron interval for efficient sending. For instance, sending 20 emails every 5 minutes allows for 240 emails per hour, while 40 doubles that to 480. If you send marketing emails you often like to send them as fast as possible. While this is great in theory it's often not recommended for your general email marketing strategy. (more... ) --- ### Manually replacing a Mailster version - Published: 2021-03-22 - Modified: 2025-04-02 - URL: https://kb.mailster.co/manually-replacing-a-mailster-version/ - Categories: General Mailster includes security features to protect against malicious versions. To ensure you have a legitimate copy, obtain a valid license from EverPress, replace the plugin on your website, and register your purchase code in the Mailster Dashboard. Follow these steps to maintain a secure installation. Mailster has some security mechanisms built in to prevent you from being infected with a malicious version. If you ever come in a situation where you are not sure if you have a legal and clean version directly from us (EverPress) you should immediately follow these steps. (more... ) --- ### Mailster Customization Services - Published: 2020-10-06 - Modified: 2025-04-02 - URL: https://kb.mailster.co/mailster-customization-services/ - Categories: Customization - Tags: codeable Need custom website work? Partner with Codeable, the leading WordPress freelancer platform. Simply fill out a form for a direct response. Enjoy vetted experts, timely delivery, fixed pricing, and a 28-day bug fix warranty. Experience hassle-free support and quality service tailored to your needs! Need some custom work done for your website? We have an amazing partner who can help! Read more --- ### Sending post-purchase coupon codes to WooCommerce customers. - Published: 2020-08-15 - Modified: 2025-04-03 - URL: https://kb.mailster.co/sending-post-purchase-coupon-codes-to-woocommerce-customers/ - Categories: Tutorial - Tags: autoresponder, coupon, woocommerce Easily offer discounts to customers after purchases with Mailster and WooCommerce. Set up a customer journey that includes sending a follow-up email with a coupon code after 24 hours. Create dedicated lists, landing pages, and autoresponders for seamless engagement, ensuring a smooth discount process. In many cases, you would like to offer a discount to your customers once they buy a certain product. With Mailster and WooCommerce, you can do this pretty simply. (more... ) --- ### Send your newsletters via Gmail - Published: 2020-06-22 - Modified: 2025-04-02 - URL: https://kb.mailster.co/send-your-newsletters-via-gmail/ - Categories: Tutorial, Extensions - Tags: gmail, google Gmail is a popular email provider, but it's not ideal for marketing due to strict limits and potential spam issues. For effective newsletter campaigns with Mailster, consider alternatives. Integrate Gmail through the Mailster plugin by setting up a Google web app and OAuth credentials to ensure smooth delivery. Gmail by Google is a great email delivery provider, and you can use it to send all your newsletter campaigns with Mailster. In general, we do not recommend using Gmail for marketing emails so you better look out for an alternative. Since Gmail is not built for sending marketing emails, you have to consider a couple of things: Google is very restrictive with its service, and if your subscribers start marking your emails as spam, you will most likely get banned from the platform. With a free Gmail account, you have more limits than with a paid G Suite account (Read more about limits). You should only send from your Gmail address (free users) or your registered G Suite addresses. (more... ) --- ### The Mailster Cookie - Published: 2020-01-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/the-mailster-cookie/ - Categories: General - Tags: cookie Mailster sets a cookie named "mailster" when a subscriber clicks a campaign link, allowing user identification even without an account or login. This cookie expires one hour after the last click but can be extended. It’s generated using PHP's setcookie method, not JavaScript. Whenever a subscriber clicks a link in a campaign, Mailster sets a cookie on your domain to identify the user at a later point. This is required as often the subscriber doesn't have an account on your site or is not logged in. (more... ) --- ### Grace Period - Published: 2019-09-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/grace-period/ - Categories: Tips, Developer - Tags: autoresponder Mailster allows multiple autoresponders to automate campaigns, utilizing a default one-week "Grace Period" to prevent accidental sends. Users can easily adjust this period to one month or disable it entirely through simple filters, ensuring targeted communication with subscribers. In Mailster you can have multiple autoresponders to trigger your campaigns automatically. Some of them have a date or timestamp to get triggered within a certain timeframe. To not go way back to the beginning of time (and to accidentally send to all your subscribers), Mailster uses a "Grace Period". (more... ) --- ### List Based and Global Subscriptions - Published: 2019-09-09 - Modified: 2025-04-02 - URL: https://kb.mailster.co/list-based-and-global-subscriptions/ - Categories: General, Settings - Tags: status, subscriptions Mailster offers two subscription models: list-based (recommended for flexibility) and global subscriptions. Subscribers can unsubscribe from individual lists or all at once. Only those with a "subscribed" status receive campaigns, ensuring tailored communication based on user preferences. Adjust subscription types easily in the settings. Mailster can handle subscriptions in two different ways. List-based subscriptions (default) Global subscriptions (more... ) --- ### Encode Tags for Links - Published: 2019-09-01 - Modified: 2025-04-03 - URL: https://kb.mailster.co/encode-tags-in-links/ - Categories: Tutorial, Developer - Tags: tags When using Mailster tags in links, remember to encode them with PHP's rawurlencode. Prepend an exclamation mark (!) to the tag name (e.g., {!mytag}) for proper encoding. Avoid this method for tags containing full links to ensure functionality. If you are using Tags in Mailster you may like to use them in your links as well. Since links must be encoded, the content of your tags must be encoded as well. (more... ) --- ### RSS Email Campaigns - Published: 2019-05-22 - Modified: 2025-04-02 - URL: https://kb.mailster.co/rss-email-campaigns/ - Categories: Features - Tags: autoresponder, legacy, rss Mailster allows you to automate recurring autoresponders using RSS Feeds, ideal for integrating external content. For content from your own site, use dynamic tags. You can dynamically populate email subject lines with RSS titles, ensuring your campaigns are timely and relevant with each new feed item. Mailster can use RSS Feeds to automatically create your recurring autoresponders. This method is useful if you like to use content from a different website. If you like to use posts from your own site (where Mailster is installed), you better go with regular dynamic tags. (more... ) --- ### Dynamic Custom Post Types - Published: 2019-05-22 - Modified: 2025-04-03 - URL: https://kb.mailster.co/dynamic-custom-post-types/ - Categories: Developer, Features - Tags: post types, tags Mailster's dynamic tag engine allows you to create custom post types that generate content on demand, enabling endless possibilities for newsletter personalization. You can display various content like popular posts or cart items using dynamic tags, enhancing user engagement in your campaigns. Mailster has a powerful tag engine built in where you can dynamically populate your newsletter campaigns. Dynamic Custom Post Types work similarly to regular post types but are not stored in your database but generate content on demand. (more... ) --- ### Random Dynamic Posts - Published: 2019-05-22 - Modified: 2025-04-02 - URL: https://kb.mailster.co/random-dynamic-posts/ - Categories: Features - Tags: random, tags Mailster's random posts feature complements dynamic posts by displaying a random post under the same conditions. Using tags like {post_title:~7}, you can ensure consistency within campaigns. Each random tag is linked to a unique seed, allowing for varied post displays without duplication within the same campaign. If you are familiar with dynamic posts in Mailster you will quickly understand the usage of random posts. (more... ) --- ### WordPress displays a 404 error after updating the campaign - Published: 2019-05-11 - Modified: 2025-04-03 - URL: https://kb.mailster.co/wordpress-displays-a-404-error-after-updating-the-campaign/ - Categories: Troubleshoot - Tags: 404 If your WordPress site redirects to /wp-admin/post.php, it may be due to misconfigured mod_security settings. This often stems from specific tags. To resolve the issue, contact your host, disable the module, or adjust the .htaccess file. Restart Apache after making changes for them to take effect. If you have ever experienced this problem where your WordPress site redirects you to https://yoursite. com/wp-admin/post. php it may be caused by false settings in your mod_security module on your server. (more... ) --- ### Use Unsplash images in Email Campaigns - Published: 2019-04-12 - Modified: 2025-04-02 - URL: https://kb.mailster.co/unsplash/ - Categories: Features - Tags: picpicker, unsplash With Mailster, access over 1,000,000 free photos through Unsplash directly in the editor. Easily add images to your email campaigns by using the pic-picker. While crediting photographers is optional, it's recommended to include their names in the alt text for best practices. With Mailster you can use over 1. 000. 000 photos for free directly in the editor. All photos are released under the Unsplash License. (more... ) --- ### What information will be tracked by opting into usage tracking? - Published: 2019-03-19 - Modified: 2025-04-02 - URL: https://kb.mailster.co/usage-tracking/ - Categories: Settings With Mailster 4.0, usage tracking is optional during installation or updates. Opting in helps us improve features and fix bugs. Data collected includes site details and Mailster settings, but we never share this information. You can enable or disable tracking anytime in the settings. We no longer track this info since Mailster 4. 0. If you still use an older version you should consider updating! On installing or updating the plugin, Mailster will ask if you would like to opt into usage tracking. By doing this, you are helping us with better planning of new features, fixing bugs, and prioritizing development based on user feedback. (more... ) --- ### Why do my emails end up in the Gmail Promotions Tab? - Published: 2019-02-26 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-do-my-emails-end-up-in-the-gmail-promotions-tab/ - Categories: Troubleshoot - Tags: gmail To improve the chances of your Mailster campaigns landing in Gmail's Primary Inbox, minimize images, favor plain text, limit external links, personalize sender names, and avoid excessive social links. Remember, content type and user preferences ultimately determine where emails are placed. When you send your Mailster campaigns Google will scan the incoming message and - depending on the kind of content - assigns the email to the Primary Inbox, to the Social Tab, or to the Promotions Tab. The idea is to ensure that the Primary Inbox remains clean and make it easier for their users to find the information that matters to them the most. (more... ) --- ### Permalink Structure - Published: 2019-02-25 - Modified: 2025-04-02 - URL: https://kb.mailster.co/permalink-structure/ - Categories: Troubleshoot, Tips - Tags: links, permalinks Mailster utilizes custom rewrite rules for user navigation and link processing on the newsletter homepage. Issues with links may arise if Permalinks are not configured. To enhance URL appearance, visit Settings > Permalink and click "Save Changes" to refresh the permalink structure. For detailed guidance, refer to the official documentation. Mailster uses custom rewrite rules to process certain actions and to route users on the newsletter homepage. If you have problems with links this article can help. (more... ) --- ### I have problems registering the plugin - Published: 2019-02-17 - Modified: 2025-04-02 - URL: https://kb.mailster.co/i-have-problems-registering-the-plugin/ - Categories: Troubleshoot - Tags: license, license code, licensecode, na, purchase code As of March 15, 2023, Mailster installation requires a valid purchase code for license activation. Common verification errors include invalid codes, already used licenses, and email mismatches. Ensure you accept the Terms of Service, and if issues persist, consider opening a support ticket. Update 15th March 2023This Article is no longer valid. If you install Mailster you have to validate your purchase code. This ensures you have a valid license and are eligible to use Mailster on your site. Here are the error messages which can show up during the verification process. The Mailster Verification Form (more... ) --- ### Working with animated GIFs in Mailster - Published: 2019-02-12 - Modified: 2025-04-02 - URL: https://kb.mailster.co/working-with-animated-gifs-in-mailster/ - Categories: Tutorial, Tips - Tags: gif Animated GIFs can enhance your email marketing, but Mailster's default image resizing may lose animation. To preserve it, use Mailster's built-in option to insert the original image instead. This ensures your GIFs maintain their lively appeal in your campaigns. Animated GIFs can bring some life to your email marketing campaigns. Since Mailster uses WordPress native methods to resize images, so they fit correctly and reduce file size, the animation is may lost during this process. (more... ) --- ### Handling Bounces with AmazonSNS - Published: 2018-11-27 - Modified: 2025-04-02 - URL: https://kb.mailster.co/handling-bounces-with-amazonsns/ - Categories: Tutorial, Extensions - Tags: amazonses To manage bounces more effectively with Amazon SES in Mailster, switch to Amazon SNS for enhanced control. Set up SNS notifications by creating topics for bounce and complaint feedback. After configuring subscriptions, your Mailster installation will automatically track bounces and complaints from subsequent campaigns. If you are sending your Campaigns with Amazon's Simple Email Service you can use the regular Bounce option that comes with Mailster. If you like to have more control over bounces you should switch to AmazonSNS. (more... ) --- ### How many subscribers can Mailster handle? - Published: 2018-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-many-subscribers-can-mailster-handle/ - Categories: Troubleshoot, Tips - Tags: performance Mailster offers unlimited subscribers, lists, forms, and campaigns, but server limits may affect performance. To optimize, maintain fewer subscribers, simplify custom fields, and reduce autoresponder complexity. For best results, use PHP 7.4+, at least 128MB memory, and consider a dedicated server or VPS. Technically there are no limits in Mailster. You can have unlimited subscribers, lists, forms, and campaigns. There are some server-related limits though. (more... ) --- ### Send your Newsletters via SendGrid - Published: 2018-10-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/send-your-newsletters-via-sendgrid/ - Categories: Tutorial, Extensions - Tags: sendgrid, smtp Integrate SendGrid with Mailster by signing up, creating an API key with specific permissions, and authenticating your sender. Choose between Domain Authentication or Single Sender Verification. Finally, test your setup by sending a test message through Mailster to ensure everything functions correctly. SendGrid is a powerful sending provider that works with Mailster. (more... ) --- ### How to migrate Mailster to a new site - Published: 2018-10-01 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-to-migrate-mailster-to-a-new-site/ - Categories: Tutorial - Tags: export, import To transfer Mailster from one site to another, back up both databases, optionally export data, and copy the Mailster tables to the new site. Export campaigns and settings from the original site, deactivate the license, install Mailster on the new site, and then import the campaigns and settings. Depending on your license you can use Mailster on one site or more. If you like to use your single-use license on a different domain and move all the data from Site A to Site B you have to follow some steps. (more... ) --- ### User Ratings - Published: 2018-09-12 - Modified: 2025-04-03 - URL: https://kb.mailster.co/user-ratings/ - Categories: General, Features - Tags: rating, subscriber Mailster's user ratings reflect subscriber engagement, updated with each interaction—opens and clicks boost ratings, while bounces and unsubscribes lower them. Ratings, ranging from 10% to 100%, prioritize sending campaigns to higher-rated subscribers. You can also segment lists based on ratings and customize them programmatically. User or Subscriber ratings are a quick way to see the most engaging subscribers in Mailster. (more... ) --- ### Adding Content to your Forms - Published: 2018-06-04 - Modified: 2025-04-03 - URL: https://kb.mailster.co/adding-content-to-your-forms/ - Categories: Customization, Developer - Tags: form, forms, legacy This article outlines how to customize Legacy Forms using Mailster. You can enhance forms with additional content by employing the mailster_form filter hook. Target specific forms like Unsubscribe or Profile with dedicated hooks. Explore more about integrating custom code and maximizing form functionality on your site. This article is used for Legacy Forms and no longer works on Block Forms! Mailster forms can be defined and customized via the forms page. You can add additional content via some coding by using the mailster_form filter hook. (more... ) --- ### Disabling the Inline Editor - Published: 2018-04-23 - Modified: 2025-04-03 - URL: https://kb.mailster.co/disabling-the-inline-editor/ - Categories: Customization - Tags: editor, legacy This article is outdated for the latest Mailster version. The Inline Editor enhances campaign creation efficiency. To revert to the old editor, simply use the code: `add_filter('mailster_inline_editor', '__return_false');`. For more on adding custom code, check the provided link. This article is no longer relevant to the latest version of Mailster. The Inline Editor in Mailster was made to improve the workflow and speed up the process of creating campaigns and autoresponders. If you like to bring back the old editor you can use one simple code line. (more... ) --- ### Mailster Subscriber Query - Published: 2018-04-04 - Modified: 2025-04-03 - URL: https://kb.mailster.co/subscriber-query/ - Categories: Developer - Tags: query, segmentation Mailster simplifies subscriber segmentation with its Subscriber Query feature, allowing custom coding for tailored results. Users can query subscribers based on various parameters, including conditions, fields, and search terms, enabling precise targeting and management of subscriber lists efficiently. Mailster offers an easy way to get your subscribers via segmentation. If you like to get more out of this via some custom coding you can use the Subscriber Query. (more... ) --- ### Using Multi language Newsletter with WPML - Published: 2018-04-03 - Modified: 2025-04-02 - URL: https://kb.mailster.co/using-multi-language-newsletter-with-wpml/ - Categories: Tutorial, Extensions - Tags: wpml With Mailster and the WPML plugin, you can effortlessly create multi-language email campaigns. Set up forms and translate settings for each language, then design tailored newsletters. Create campaigns for each language, applying specific conditions to target users effectively. Enhance your reach with localized communication! With Mailster, you can send multi-language campaigns if you use the WPML plugin for your site. multi --- ### Security Nonce is invalid - Published: 2018-04-02 - Modified: 2025-04-02 - URL: https://kb.mailster.co/security-nonce-is-invalid/ - Categories: Troubleshoot - Tags: form, nonce Mailster forms use WordPress Nonces to prevent invalid submissions, but these can expire after 24 hours, often due to caching. If you encounter an error, consider disabling caching on pages with Mailster forms via the Advanced Settings. Alternatively, adjust nonce settings for internal forms to ensure functionality. Mailster form uses WordPress Nonces to prevent invalid form submissions. These nonces can expire in some cases which causes an error message if you like to sign up for a newsletter. (more... ) --- ### Mailster and GDPR - Published: 2018-03-28 - Modified: 2025-04-02 - URL: https://kb.mailster.co/gdpr/ - Categories: Tips - Tags: gdpr The GDPR, effective May 25, 2018, mandates key principles for data protection, including obtaining consent, the right to access, the right to be forgotten, and breach notification. Mailster supports compliance, but additional measures may be needed. Consult a lawyer for tailored guidance on GDPR regulations. The General Data Protection Regulation (GDPR) is enforceable as law in all EU member states on May 25, 2018. While Mailster is in technical compliance with this law, you may have to bring some additional things into place to make the whole process compliant for your site. (more... ) --- ### Mail Headers in Mailster - Published: 2018-03-04 - Modified: 2025-04-03 - URL: https://kb.mailster.co/mail-headers-in-mailster/ - Categories: Developer - Tags: header Mailster sends emails as multi-part MIME messages with headers that identify the sender and campaign. Key headers include version numbers, unique hashes for subscribers, and unsubscribe links, essential for compliance with email providers. Custom headers can also be added for personalization, enhancing user engagement. Each email sent with Mailster is technically a multi-part message in MIME format. It contains three sections: Header Plain Text Part HTML Part (more... ) --- ### Adding Posts to your Campaign - Published: 2017-11-09 - Modified: 2025-04-02 - URL: https://kb.mailster.co/adding-posts-to-your-campaign/ - Categories: General, Getting Started - Tags: content, post types, tags Mailster offers seamless integration with WordPress, allowing users to easily add posts, pages, or custom post types to campaigns. You can include static content, which remains unchanged, or dynamic content that updates upon sending. Customize your campaigns with filters for tailored content display. One of the core features of Mailster is the deep integration with WordPress. To get your posts and articles into your campaign, you have two ways to add them. Next to regular posts, you can also include pages or any custom post type in the same fashion. (more... ) --- ### WordPress Users in Mailster - Published: 2017-09-28 - Modified: 2025-04-01 - URL: https://kb.mailster.co/wordpress-users-in-mailster/ - Categories: Getting Started - Tags: subscribers, users, WordPress users Mailster allows seamless integration of WordPress users into your subscriber list. It offers automatic linking for matching emails, user import options, and settings to add new subscribers from registrations and comments. Keep user data synchronized by defining connection fields for updates, ensuring efficient segmentation and engagement. Mailster has a dedicated list of your subscribers so your WordPress users are by default not connected to your Mailster subscriber base. There are several ways to connect them and work with segmentation on the user data. (more... ) --- ### Send your Newsletters via Mailgun - Published: 2017-09-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/send-your-newsletters-via-mailgun/ - Categories: Tutorial, Extensions - Tags: mailgun Mailgun is a developer-friendly email provider that integrates seamlessly with Mailster for campaign sending. To get started, sign up, add your domain, and configure DNS entries. Download the Mailgun add-on for Mailster, enter your API key, and choose between the WEB API or SMTP for sending. Mailgun is a developer-friendly email provider and if you use Mailster you can use it to send your campaigns. (more... ) --- ### Validating Custom Fields - Published: 2017-08-14 - Modified: 2025-04-03 - URL: https://kb.mailster.co/validating-custom-fields/ - Categories: Customization, Developer, Tutorial - Tags: custom fields Mailster allows you to create custom fields for subscriber information, such as a birthday field. By adding custom code, you can verify that subscribers are over 18, preventing those underage from signing up. The code checks the provided birthdate and displays an error message if the user is younger than 18. Mailster gives you the option to define custom fields where you can store additional information of your subscribers. Sometimes you need to verify these values with some custom code. (more... ) --- ### Send your Newsletters via SparkPost - Published: 2017-08-08 - Modified: 2025-04-04 - URL: https://kb.mailster.co/send-your-newsletters-via-sparkpost/ - Categories: Tutorial, Extensions - Tags: smtp, sparkpost SparkPost is a reliable email delivery service that requires setup, including domain verification and API key creation. While it no longer offers a free tier, a "Test Account" can be used for evaluation. Users must configure DNS settings and integrate with Mailster to start sending emails effectively. With SparkPost you get a solid delivery provider. There's some setup required before you can use this service though. SparkPost no longer offers a free tier but you can test their service with a "Test Account". (more... ) --- ### Using WooCommerce in your Newsletter Campaigns - Published: 2017-08-03 - Modified: 2025-04-03 - URL: https://kb.mailster.co/using-woocommerce-in-your-newsletter-campaigns/ - Categories: Customization, Tips, Tutorial - Tags: woocommerce Enhance your WooCommerce shop's outreach with Mailster's WooCommerce add-on. Effortlessly send auto-responder campaigns featuring your latest products. Utilize dynamic content, customizable metadata, and formatting options to present prices attractively. Streamline your marketing by integrating WooCommerce products directly into your email campaigns. If you're running a WooCommerce Shop and like to send your latest products to your audience you can use Mailster with the WooCommerce add-on. (more... ) --- ### Get the current subscriber - Published: 2017-07-30 - Modified: 2025-04-03 - URL: https://kb.mailster.co/get-the-current-subscriber/ - Categories: Developer - Tags: functions.php Mailster provides methods to retrieve the current subscriber information and their ID. It sets a cookie with the subscriber's hash upon link clicks, expiring in 60 minutes. You can extend this expiration to three hours using a simple filter. Sometimes you need the current subscriber on your website. Mailster has some built-in methods to get this information. (more... ) --- ### Where are the module screenshots? - Published: 2017-07-27 - Modified: 2025-04-02 - URL: https://kb.mailster.co/where-are-the-module-screenshots/ - Categories: Troubleshoot, Templates - Tags: module, screenshots Mailster generates template screenshots on our server, but issues may arise. Thumbnails may not appear due to uncreated images, server restrictions, disabled options, broken HTML, or outdated versions. Ensure your server can connect, check settings, and update Mailster. You can also delete thumbnails to regenerate them. Mailster tries to create screenshots of your template files on the fly on one of our servers. This should happen without any further action, but doesn't in a couple of situations. When you create a new campaign with a template for the first time, you may miss the module screenshots on the right.  This can be caused by these reasons: (more... ) --- ### Why does the {post_image} tag not work? - Published: 2017-07-23 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-does-the-post_image-tag-not-work/ - Categories: Troubleshoot - Tags: editbar The {post_image:X} tag in Mailster allows you to use a post's featured image within your email campaigns. Unlike other tags, it must be placed within an tag. You can easily edit and insert images using the image picker, which provides automatic size adjustments. If you know Tags in Mailster you may know the {post_image:X} tag. It uses the feature image of the chosen post with ID X. Beside other tags this one works a bit differently. (more... ) --- ### How to redirect after form submission? - Published: 2017-06-26 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-to-redirect-after-form-submission/ - Categories: Customization - Tags: form, forms Mailster forms use AJAX for seamless submissions, providing users with confirmation messages. Users can redirect submissions to specific pages via form settings. Two redirection options are available: after submission (regardless of double-opt-in) and after confirmation (for double-opt-in users), allowing tailored user experiences. By default Mailster forms are ajax based and you get a nice confirmation message after your users have submitted the form. If you like to redirect them to a specific page you can find this option in the form settings. (more... ) --- ### Keep certain tags in your campaigns - Published: 2017-06-13 - Modified: 2025-04-03 - URL: https://kb.mailster.co/keep-certain-tags-in-your-campaigns/ - Categories: Customization, Developer - Tags: tags Mailster automatically removes unused tags from your campaign, but you can whitelist specific ones using the 'mailster_keep_tags' filter. Add your desired tags, like {my-special-tag} and {my-other-tag}, to ensure they remain in your campaign with variations. By default, Mailster will remove all unused tags in the final version of your campaign. To prevent that you can whitelist certain tags with some custom code. (more... ) --- ### Using Mailster Forms (Deprectated) - Published: 2017-06-02 - Modified: 2025-04-02 - URL: https://kb.mailster.co/using-mailster-forms/ - Categories: Customization, Getting Started - Tags: form, legacy Mailster offers versatile sign-up forms for various platforms, including WordPress and plain HTML. You can embed forms using shortcodes, a customizable Subscriber Button, or raw HTML. This article focuses on Legacy Forms, but be sure to explore the new block-based forms for enhanced features. Mailster includes sign-up forms you can use in many different ways. If you are running other websites- whether they are based on WordPress, a different CMS, or just plain HTML - you can embed external forms to collect leads on them. This article is about Legacy Forms - Check out the new, block-based forms if you use them. (more... ) --- ### Saving new Template Files - Published: 2017-06-01 - Modified: 2025-04-02 - URL: https://kb.mailster.co/saving-new-template-files/ - Categories: Customization, Templates, Tutorial - Tags: template Mailster Templates kickstart your campaigns by allowing customization. Choose a template, start a new campaign, and add desired modules. Save your customizations as a new template or overwrite an existing one. You can also adjust headers, footers, and notifications, enhancing your campaign's uniqueness and functionality. Mailster Templates give you a great start to get your campaigns going. If the provided modules don't fit your needs or you like to have custom starting content you should save your custom template file. (more... ) --- ### Adding a Terms of Service checkbox to your forms - Published: 2017-05-28 - Modified: 2025-04-02 - URL: https://kb.mailster.co/adding-a-terms-of-service-checkbox-to-your-forms/ - Categories: Customization - Tags: gdpr, legal This article emphasizes the importance of compliance with email marketing laws using Mailster. It enables users to add a mandatory confirmation checkbox to sign-up forms, ensuring GDPR compliance. Users can customize error messages and link to terms of service, enhancing legal adherence in various countries. This article is no longer valid if you use Block Forms. Please check out the guide here. Many countries have strict laws when it comes to email marketing which is a good thing. With Mailster you have a tool you can fulfill legal requirements from almost any country in the world. Some countries require you to add a confirmation checkbox where users have to agree that they sign up for your service. (more... ) --- ### Moving subscribers to different lists - Published: 2017-05-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/moving-subscribers-to-different-lists/ - Categories: Customization, Developer - Tags: lists Easily manage subscriber lists in Mailster with simple UI options or custom code. You can assign or unassign subscribers based on actions like clicking a link or opening a campaign, using functions like `assign_lists` and `unassign_lists`. Tailor subscriber movements to enhance engagement effectively. It's easy to assign subscribers to the list with the UI of Mailster. Just select the subscribers you like to assign and select the option from the drop-down. To get more specific, you need to add some custom code to your website. (more... ) --- ### Changing the static Auto Tag Output - Published: 2017-05-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/changing-the-static-auto-tag-output/ - Categories: Customization - Tags: auto tag, tags Mailster's auto feature allows you to manage static content by modifying the functions.php file. You can customize the output using the "mailster_auto_post" filter, adjusting the title, content, and other parameters. The default data includes title, excerpt, and link, allowing for flexible email automation. Next to dynamic content, you can also find your static content in the auto feature of Mailster. To change the output, you have to add some custom code to your theme's functions. php. (more... ) --- ### Adding custom code to your website - Published: 2017-05-20 - Modified: 2025-04-02 - URL: https://kb.mailster.co/adding-custom-code-to-your-website/ - Categories: Customization, Tips - Tags: functions.php, third party plugin To extend your WordPress site's functionality, you can add custom code in two ways: the theme's functions.php file, which is theme-specific, or by creating a dedicated plugin for use across multiple themes. Both methods offer similar performance, but plugins allow easier management. Sometimes it's required to add custom code that extends the functionality of your website. In WordPress, you have two ways that are recommended. (more... ) --- ### Adding a Date Picker to your forms - Published: 2017-05-20 - Modified: 2025-04-03 - URL: https://kb.mailster.co/adding-a-date-picker-to-your-forms/ - Categories: Customization - Tags: datepicker, form, legacy, na For legacy forms, you can enhance date fields by adding a date picker using a simple code snippet. This allows for better subscriber engagement, such as in birthday campaigns. Customize the appearance by selecting different themes from the jQuery UI homepage to align with your website's design. This method is for legacy forms only! If you use block forms, you have built-in date pickers already. Custom Fields can store different values from your subscribers. If you like to create a Birthday campaign for instance, you have to set up a date field. By default, there's no date picker applied to that field as the look wouldn't match your theme. (more... ) --- ### How to remove Visual Composer shortcodes in campaigns - Published: 2017-04-27 - Modified: 2025-04-03 - URL: https://kb.mailster.co/how-to-remove-visual-composer-shortcodes-in-campaigns/ - Categories: Tips - Tags: shortcodes, visual composer If you're using Visual Composer in WordPress and encountering shortcode issues with Mailster, you can remove them by adding custom snippets to your theme’s functions.php. This ensures that the content remains intact while filtering out undesired shortcodes. Adjust the snippets accordingly for custom post types or other page builders. If you are using Visual Composer to create your content in WordPress you may find the used shortcodes in your campaign. (more... ) --- ### Mails are send but not delivered - Published: 2017-04-27 - Modified: 2025-04-02 - URL: https://kb.mailster.co/mails-are-send-but-not-delivered/ - Categories: Troubleshoot - Tags: sendmail, smtp Mailster's email delivery relies on your sending server's response, but a "success" message doesn't guarantee inbox delivery. Emails may end up in spam, bounce back, or face delays. Use Mailster's Email Health Check to assess deliverability and consider changing delivery methods or servers if issues persist. When Mailster sends an email via your chosen delivery method it always relies on the response of your sending server. Sometimes the message has been sent but not actually delivered. (more... ) --- ### Setup Automatic Bounce Handling - Published: 2017-03-28 - Modified: 2025-03-31 - URL: https://kb.mailster.co/setup-automatic-bounce-handling/ - Categories: General - Tags: bounce Mailster automates bounce processing with proper setup. Assign a dedicated bounce address, enter server credentials, and define bounce check options. Soft bounces are retried while hard bounces result in immediate subscriber removal. Regularly test your settings to ensure functionality and maintain a clear postbox. Mailster can automatically process bounces, which requires some setup. All emails sent before this setup do not get processed. (more... ) --- ### Mailster and WooCommerce - Published: 2017-03-20 - Modified: 2025-04-02 - URL: https://kb.mailster.co/mailster-and-woocommerce/ - Categories: Extensions - Tags: woocommerce Enhance your WooCommerce shop with a free WordPress add-on to convert customers into newsletter subscribers. Automate email workflows based on product purchases, customize subscriber lists, and manage signup options. Ensure compliance with legal requirements by utilizing the Double-Opt-In feature for user confirmations. If you are running your own shop with WooCommerce and would like to get your customers as subscribers to your newsletter campaigns check out the WooCommerce add-on available for free on the WordPress repo. (more... ) --- ### Access to admin-ajax.php is blocked - Published: 2017-03-19 - Modified: 2025-04-03 - URL: https://kb.mailster.co/access-to-admin-ajax-php-is-blocked/ - Categories: Troubleshoot - Tags: ajax The admin-ajax.php file is crucial for Mailster's backend functions. If it's blocked, issues may arise from plugin conflicts, host firewalls, .htaccess rules, or cross-domain mismatches. To resolve Ajax problems, check and adjust these elements or deactivate conflicting plugins. The admin-ajax. php file is used by Mailster to perform various actions in your backend. If this file is blocked or not accessible, it's most likely that Mailster isn't working correctly. (more... ) --- ### Changing text snippets - Published: 2017-03-18 - Modified: 2025-04-03 - URL: https://kb.mailster.co/changing-text-snippets/ - Categories: Customization, Developer - Tags: text Mailster lets you customize internal text snippets easily. You can adjust them in the Text tab or use the `mailster_text` filter for more flexibility. Key snippets include confirmation messages, success notifications, and error alerts. Just add a filter to change specific texts programmatically! Mailster has some internal texts which are used at various locations. By default, you can change them on the Text tab in the settings, but if you like a more flexible approach, you can simply change them by a hook via the mailster_text filter. (more... ) --- ### Add custom dynamic tags to your newsletter - Published: 2017-03-18 - Modified: 2025-04-03 - URL: https://kb.mailster.co/add-custom-dynamic-tags-to-your-newsletter/ - Categories: Customization - Tags: tags Enhance your newsletters with dynamic content using custom tags. By adding code snippets to your theme's functions.php, you can create unique tags like {mytag} or {coupon} for personalized content, such as coupon codes, tailored to each subscriber. This ensures engaging and relevant communication. Sometimes you need to add some custom dynamic content to your newsletters. You may use it for coupon codes, custom status, or even the weather in a specific region. To achieve that, you can start with this snippet (more... ) --- ### Sending Plain Text Emails - Published: 2017-03-13 - Modified: 2025-04-02 - URL: https://kb.mailster.co/sending-plain-text-emails/ - Categories: Customization, Templates, Tips - Tags: plain text To send plain text-like emails in Mailster, create a new campaign, switch to code view, delete the existing HTML, and enter your text. This keeps the advantages of HTML while allowing for easy editing. Your emails will appear plain text but function as HTML for better compatibility. For tracking reasons, you can only send HTML emails in Mailster. If you like to send plain text messages there is a simple trick you can do. (more... ) --- ### How to add a Google Maps API Key - Published: 2017-02-02 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-to-add-a-google-maps-api-key/ - Categories: Tutorial - Tags: google, maps Mailster integrates Google Maps to visualize subscriber locations. To set it up, create a Google API Key by enabling the Google Maps Platform and selecting a project. Secure your API key with HTTP referrers for your domain, and remember to add any email service domains for notifications. Mailster uses Google Maps to display the location of your subscribers. To display them you have to set up a Google API Key. (more... ) --- ### Add Subscribers - Published: 2017-01-12 - Modified: 2025-04-03 - URL: https://kb.mailster.co/add-subscribers/ - Categories: Developer Easily manage subscribers in Mailster using simple code. Add a single email or detailed subscriber info, update existing subscribers, assign them to lists, or remove them effortlessly. Each action returns relevant IDs or status, facilitating efficient email list management. Explore more for developer insights. You can quickly add subscribers in Mailster with some lines of code. (more... ) --- ### Mailster for Developers - Published: 2017-01-12 - Modified: 2025-04-03 - URL: https://kb.mailster.co/mailster-for-developers/ - Categories: Developer Mailster is built for developers, featuring hooks and filters for customization. You can add subscribers easily, manage lists, and even unsubscribe users with simple functions. Use the Mailster Closure to ensure your code runs smoothly, only if Mailster is active. Get started with seamless integration today! When we developed Mailster, we always considered the needs of developers. That's why Mailster includes a variety of hooks and filters, allowing you to extend and customize your Mailster installation to meet your specific requirements. (more... ) --- ### Tags in Mailster - Published: 2016-12-28 - Modified: 2025-04-03 - URL: https://kb.mailster.co/tags-in-mailster/ - Categories: Customization, Getting Started - Tags: tags Tags in Mailster serve as placeholders in your campaigns, dynamically replaced with subscriber-specific content during sending. Use the format {tagname} for tags, and set alternative content with {tagname|alternative}. Dynamic tags allow for customized content display, enhancing engagement in newsletters. Explore more in the "Tags" Tab on the Settings page! Tags are placeholders in your campaigns and are an essential part of Mailster. They always get replaced with their desired content when The campaign is prepared to send You preview the campaign You visit the web version of a campaign (more... ) --- ### Your First Campaign - Published: 2016-12-28 - Modified: 2025-04-02 - URL: https://kb.mailster.co/your-first-campaign/ - Categories: Getting Started - Tags: editor, optionbar Activate the plugin and create your first campaign via the "New Campaign" option in the "Newsletter" menu. Customize your campaign's title, sender details, and content using various modules. Adjust colors, enable tracking, and define your audience in the Receivers Meta Box for targeted delivery. If you have successfully activated the plugin you can create your first campaign like a regular post. Click on "New Campaign" in the "Newsletter" Menu. (more... ) --- ### How to install Mailster - Published: 2016-12-28 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-to-install-mailster/ - Categories: Getting Started - Tags: install To install Mailster, go to the Plugins page, click "Add New," then "Upload Plugin." Select the mailster-x.x.x-zip file from your desktop and click "Install Now." After installation, activate the plugin to access the Setup Wizard for customization. You can install Mailster by going to your Plugins page and clicking on the "Add New" button at the top of the page. https://www. youtube. com/watch? v=IYOXRbwSCpw Continue by clicking on "Upload Plugin" and selecting the mailster-x. x. x-zip from your desktop. Click on "Install Now" and the package will get uploaded and extracted on your WordPress site. After this step, you can directly activate the plugin. If you are using a fresh version of Mailster you will get redirected to the Setup Wizard which helps you to set up Mailster to your needs. --- ### Updating MyMail to Mailster - Published: 2016-12-22 - Modified: 2025-04-03 - URL: https://kb.mailster.co/updating-mymail-to-mailster/ - Categories: General We're excited to enhance your experience with Mailster by launching a new support and license center. This upgrade allows you to manage licenses and track support tickets efficiently. Enjoy a free update, with improved features and functionality on the horizon. Remember to back up your data before updating! Providing our customers with the best email marketing software possible to increase their interaction and grow their business has always been our main goal. To serve you even better in the future, we are changing some important things in how we manage and help our customers. (more... ) --- ### Working with action hook auto responders - Published: 2016-07-31 - Modified: 2025-04-03 - URL: https://kb.mailster.co/working-with-action-hook-auto-responders/ - Categories: Tutorial, Autoresponder, Series - Post series: Auto responder In this fourth part of our Mailster autoresponder series, we explore Action Hook Auto Responders. These advanced tools require WordPress coding knowledge and are triggered by specific actions. Learn to customize campaigns, define delivery options, and segment receivers for targeted email marketing. This is the fourth part of a short series about auto responders in Mailster. Last time we created a time-based autoresponder. Today we take a tour of the next type of autoresponders: Action Hook Auto Responders (more... ) --- ### What is a Cron Lock? - Published: 2016-07-19 - Modified: 2025-04-02 - URL: https://kb.mailster.co/what-is-a-cron-lock/ - Categories: General - Tags: cron, cronjob Mailster prevents duplicate emails by creating a cron lock during campaign processing. If a lock is active, you'll see a notification when accessing the cron URL. Locks are released automatically after processing, but may require manual release if a timeout or error occurs. Adjust email volume if you frequently encounter locks. When Mailster sends your campaigns, it wants to make sure no duplicate emails reach your customers. For this reason, a cron lock gets created when Mailster processes the queue. (more... ) --- ### How to alter the buttons in the text editor? - Published: 2016-07-13 - Modified: 2025-04-03 - URL: https://kb.mailster.co/how-to-alter-the-buttons-in-the-text-editor/ - Categories: Customization - Tags: editor Customize your email campaigns using a rich text editor by adding buttons for formatting, font selection, and size. To enhance your editor, insert a snippet in your theme's functions.php. Note that email appearance may vary with custom styles, and three toolbar areas are available for modifications. You can change the text in your email campaigns with a rich text editor. The reason you may miss some buttons in the editor is that emails are not often WYSIWYG. To prevent confusion, some options are missing, but you can easily add more if you need. (more... ) --- ### Post Thumbnail, Oembed, and Open Graph - Published: 2016-06-22 - Modified: 2025-04-02 - URL: https://kb.mailster.co/post-thumbnail-oembed-and-open-graph/ - Categories: Features Enhance your newsletter campaigns with featured images directly from the editor, just like regular posts. Utilize Mailster's screenshot feature or embed content from platforms like Twitter and YouTube. Plus, take advantage of Open Graph for better social media sharing, making your newsletters visually appealing across platforms. Images say more than a thousand words. You may know this when adding a Feature Image to your posts but now you can do this for your newsletter campaigns too. (more... ) --- ### Subscriber Notification Options - Published: 2016-06-13 - Modified: 2025-04-03 - URL: https://kb.mailster.co/subscriber-notification-options/ - Categories: Features - Tags: subscriptions Manage your subscriber notifications effectively! Enable a summary email for your seven most recent fans, complete with location maps and user destinations. Adjust delivery times in the newsletter settings, or customize them with code to receive updates midday. Choose your preferred notification method for optimal convenience. For users who have many new subscribers each day, it quickly gets annoying to receive a notification for each new fan. If you still like to know your subscribers you can enable this option to get a nice summary of recent subscriptions. (more... ) --- ### Send your Newsletters via Amazon's SES - Published: 2016-06-03 - Modified: 2025-04-02 - URL: https://kb.mailster.co/send-your-newsletters-via-amazons-ses/ - Categories: Tutorial, Extensions - Tags: amazonses To effectively send newsletters, use a dedicated email service like Amazon SES. Install the Mailster plugin, set up your AWS account, verify your domain, and create an identity. Enable DKIM for better deliverability, update your DNS settings, and configure IAM users for secure access. It's really recommended to send your newsletters via a dedicated email service provider. One of the big players in this field is Amazon's Simple Email Service (SES). (more... ) --- ### Changing the dynamic Auto Tag Output - Published: 2016-06-01 - Modified: 2025-04-03 - URL: https://kb.mailster.co/changing-the-dynamic-auto-tag-output/ - Categories: Customization - Tags: auto tag, tags Enhance your Mailster campaigns by customizing dynamic post content through your theme's functions.php file. Use a simple function to link post titles and include author names in excerpts. Target multiple elements for more tailored content, ensuring your edit bar reflects these changes. If you regularly include dynamic posts in your campaigns you are familiar with the auto feature of Mailster. To change the content of this feature you can add a simple function in your themes function. php file. (more... ) --- ### SMTP Error: data not accepted - Published: 2016-05-31 - Modified: 2025-04-02 - URL: https://kb.mailster.co/smtp-error-data-not-accepted/ - Categories: Troubleshoot - Tags: delivery, smtp SMTP errors can arise from various issues: mismatched sender and username, oversized messages, blacklisted receivers, or temporary server limits. To resolve, ensure your From address matches your login, reduce message size, and consider pausing campaigns. For Amazon SES, verify all email addresses used in your mailings. This error occurs if you're sending via SMTP. The SMTP server rejects the mail for several reasons: Your server doesn't allow different sender and usernames Some servers require that the From email address is the same as the email address used to authenticate. Check your from-name and match it to the username you use to log in to your SMTP server. The file size of your message is too large Some servers reject a message if the body is too large. HTML emails in general are bigger than normal text messages but you should try to decrease the size by removing some content or disabling embedded images. The receiver is blacklisted or blocked Sometimes certain email addresses are blocked and to prevent getting blacklisted the server rejects your message. The best resolution is to choose a different delivery method. It's a temporary issue Sometimes the email server responds with this error if some limits have been reached or you're sending "too fast". Please pause your campaigns for a while and try again later. If you are sending via Amazon SES you must have verified the from, reply-to, and bounce address you are using in your mailings. --- ### Why does support expire? - Published: 2016-05-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-does-support-expire/ - Categories: General - Tags: support Since September 2015, Envato offers 6 months of included support for purchases. Support can be renewed on the item page, but expired support does not guarantee a response for tickets submitted post-June 2016. Users can reply to tickets for 14 days after expiration; new tickets require active licenses. In September 2015 Envato introduced a new way support gets handled. All items purchased after the 1st of September 2015 are under these new terms and authors have to apply to them. https://www. youtube. com/watch? v=NJ5qm2FnSX4 6 Month included With every purchase on the Envato Marketplaces, you get 6 months of support included. How can I renew my Support? You can extend your support period on the item page of the product. Does my support request get answered if my support for the item has expired? If you have submitted the ticket after the 1st of June 2016 a response is not guaranteed. Do I lose the right to answer a ticket if my support has expired? You can reply to your ticket up to 14 days after your license expires. New tickets can't be created if the license is expired. Where's the support policy? You can check out the item support policy on the marketplace. --- ### Translations in Mailster - Published: 2016-02-29 - Modified: 2025-04-02 - URL: https://kb.mailster.co/translations-in-mailster/ - Categories: Tutorial, Getting Started - Tags: translation Mailster is a globally used tool with varying language support. To enhance localization, users can participate in the Translation Project, fixing translations via translate.mailster.co. For custom translations, download and edit files in the wp-content/languages/plugins folder, then upload them for Mailster to use. Mailster is used around the world, and while many installations are running with an English localization even more don't.   We are running a Translation Project for Mailster which lets you help us fix missing or wrong translations. (more... ) --- ### Creating a series in Mailster - Published: 2016-02-08 - Modified: 2025-04-02 - URL: https://kb.mailster.co/creating-a-series-in-mailster/ - Categories: Tutorial, Autoresponder, Series - Tags: autoresponder - Post series: Auto responder This article recommends using Automation for creating engaging newsletter series in Mailster, known as drip campaigns. It outlines steps to set up a series, starting with a Welcome Campaign, followed by subsequent campaigns triggered by specific conditions and time delays. Adjust your audience lists accordingly for effective delivery. This article is outdated. While the steps explained still work we recommend using Automation for your Series. Creating a series of newsletter campaigns is a good way to keep your subscribers engaged with your service. But what is a series and how do you make it in Mailster? In this tutorial, we cover the basic steps of creating a series in Mailster. (more... ) --- ### Troubleshooting WordPress in 60 Seconds - Published: 2015-12-14 - Modified: 2025-04-03 - URL: https://kb.mailster.co/troubleshooting-wordpress-in-60-seconds/ - Categories: Troubleshoot Mailster adheres to WordPress Coding Standards, ensuring compatibility with compliant plugins and themes. If issues arise, test on the demo site first. Clear your cache, check for plugin conflicts, use the Health Check plugin, switch themes, and enable debugging to diagnose problems. Seek support if needed. Mailster has been tested thoroughly and follows the WordPress Coding Standards. This means it should work with every plugin or theme that also follows those standards. If you experience any issue, it's often caused by a third-party plugin or your current theme. (more... ) --- ### Why is my WordPress version no longer supported? - Published: 2015-12-04 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-is-my-wordpress-version-no-longer-supported/ - Categories: Troubleshoot, General WordPress updates introduce new features and bug fixes. While plugins that worked previously will likely continue to function, unsupported versions may encounter errors. It's essential to keep your site and plugins updated to avoid security vulnerabilities. WordPress gets constantly updated and every update brings new features and fixes bugs. (more... ) --- ### Ignore certain Posts in your Campaigns - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/ignore-certain-posts-in-your-campaigns/ - Categories: Tips Mailster allows you to automatically send your latest posts to subscribers while easily excluding specific articles. By adding a custom field called "mailster_ignore" to a post, Mailster will ignore it in dynamic tags and autoresponder campaigns, ensuring tailored content delivery. With Mailster you can send your latest posts automatically to your subscribers but sometimes you would like to exclude certain articles. (more... ) --- ### Subscriber based timezone sending - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/subscriber-based-timezone-sending/ - Categories: Tips, Features Mailster allows you to send campaigns based on your subscribers' time zones, ensuring they receive emails at optimal times. Activate "Use subscribers' timezone" for timely delivery, but schedule campaigns at least 24 hours in advance. Note that Geo Tracking must be enabled to determine subscribers' locations. If your subscribers are located in different time zones and you still like to reach them at the best time of the day this is the option you are looking for. (more... ) --- ### Setup your Birthday campaign with autoresponders - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/setup-your-birthday-campaign-with-autoresponders/ - Categories: Autoresponder - Tags: autoresponder, legacy With Mailster, easily send birthday greetings to subscribers by adding a birthday custom field. Create a campaign, set it to trigger annually based on the subscriber's birthday, and schedule it to send at midday. Save your campaign, and you're all set to celebrate! With Mailster you can send birthday greetings to your subscribers.  All you need is the birthday as a custom field. (more... ) --- ### Build an Archive of your latest Newsletters - Published: 2015-10-30 - Modified: 2025-04-03 - URL: https://kb.mailster.co/build-an-archive-of-your-latest-newsletters/ - Categories: Tips Easily display your latest campaigns chronologically by enabling the option in Settings. Remember to update permalinks if necessary and flush rewrite rules. You can also list newsletters using the shortcode , with customizable attributes for date, count, status, order, and orderby. Displaying the latest campaigns in chronological order can be achieved in an easy way. Just enable the option on the Settings page (tab Front End): (more... ) --- ### Add a list of your latest post in your campaign - Published: 2015-10-30 - Modified: 2025-04-03 - URL: https://kb.mailster.co/add-a-list-of-your-latest-post-in-your-campaign/ - Categories: Tips - Tags: tags Engage your audience by linking to older blog articles, utilizing dynamic tags for a seamless experience. Enhance visibility with structured HTML, including post titles and dates, to keep content organized and appealing. Encourage exploration of your blog's archives to maintain reader interest. People are always interested in new stuff. If not, allow them to visit your blog by offering links to older articles (more... ) --- ### Segmentation in Mailster - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/segmentation-in-mailster/ - Categories: Tips, Features - Tags: conditions, segmentation Segmenting your audience allows for precise targeting in your marketing campaigns. Mailster enables you to create recipient lists and set specific conditions based on subscriber metadata, optimizing engagement. Choose criteria like email domain or user role to effectively reach your desired audience and enhance campaign performance. With segmentation, you can easily narrow down your target audience, allowing for more precise targeting. This enables you to send your campaigns exclusively to specific user groups, optimizing the effectiveness of your marketing efforts. (more... ) --- ### Track your clicks with Google Analytics - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/track-your-clicks-with-google-analytics/ - Categories: Extensions Mailster offers detailed insights into subscriber behavior, including clicks, opens, and unsubscriptions. Easily track your newsletter campaigns alongside website visitors using Google Analytics or Piwik with our two free add-ons. Activate the extensions to customize campaign parameters and enhance your analytics experience. With Mailster you get many details from your subscribers: clicks opens, unsubscriptions, and bounces. If you watch your website's visitors via an analytics system like Google Analytics or Piwik you can now track your newsletter campaigns with them too. (more... ) --- ### Get a notification on new subscribers - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/get-a-notification-on-new-subscribers/ - Categories: Tips Easily receive notifications for new subscribers by enabling the option in the Subscribers tab of your settings. You can also select a different custom template from the drop-down menu if you have template files in your current directory. Getting notifications for new subscribers is simple by enabling the option on the Subscribers tab in settings. (more... ) --- ### Use fullname instead of first- and lastname - Published: 2015-10-30 - Modified: 2025-04-03 - URL: https://kb.mailster.co/use-fullname-instead-of-first-and-lastname/ - Categories: Tips - Tags: tags For personalized newsletters, replace the {firstname} and {lastname} tags with {fullname} for a cleaner greeting, like "Hello John!" Instead of "Hello John!" with awkward spacing, you can also use a fallback like "Hello {fullname|my friend}!" to ensure every message feels personal. When you write personalized newsletters, you are probably familiar with the {firstname} and {lastname} tag. If you use both, you should replace them with {fullname} (more... ) --- ### What is DKIM (DomainKeys Identified Mail)? - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/what-is-dkim-domainkeys-identified-mail/ - Categories: Tips - Tags: dkim DKIM (DomainKeys Identified Mail) links a domain to an email, ensuring authenticity. To enable DKIM, add a TXT record with your public key. Email programs sign messages with a private key, allowing receivers to verify authenticity. Proper setup shows a green indicator, while updates may take up to 48 hours. DKIM stands for DomainKeys Identified Mail and is a method for associating a domain name to an email message (Wikipedia) If you don't have a verified domain and you have enabled the DKIM checkbox on the settings page you get a big red box with a white input field. If you send with one of our add-ons, this setting is unnecessary as your provider handles DKIM signing. (more... ) --- ### Working with time based auto responders - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/working-with-time-based-auto-responders/ - Categories: Tutorial, Autoresponder, Series - Post series: Auto responder Time-based autoresponders send campaigns at specific intervals, like monthly updates of your latest posts. Set up a campaign by defining its subject, content, and delivery options. Utilize dynamic tags for personalization and configure scheduling preferences, including start and end dates, to optimize engagement with your subscribers. Today we take a tour of the next type of autoresponders: Time-based autoresponders What are time-based autoresponders for? They are made to send new campaigns at a specific interval Let's say we would like to send our latest three posts to our subscribers on the first of every month Create a new Campaign Define the subject and the optional preheader text.  You can use the {issue} tag to display the current issue of your autoresponder campaign. It will get increased by one every time a new campaign has been published Create the content of your mail Use the editor to add new modules and use relative tags Dynamic tags work with relative (e. g. third latest post) or absolute (e. g. post with id X). Relative Tag Absolute Tag To change the URL of an image to a dynamic tag just insert the tag in the URL field. Define the delivery options for the autoresponder The next step is to tell that campaign that it’s actually an autoresponder. Click on the autoresponder tab in the delivery meta box. Select the delay and choose "at a specific time" from the dropdown. Choose "1 day" to create a campaign every day. Define the start date of the campaign which is also the next schedule.  You can also define an end date if the campaign is planned for a certain period. If you would like to send your campaign only during weekdays uncheck the unwanted days below The next issue will get increased by one every time a new campaign has been... --- ### Working with action-based autoresponders - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/working-with-action-based-autoresponders/ - Categories: Tutorial, Autoresponder, Series - Post series: Auto responder, legacy Explore action-based autoresponders designed to launch campaigns after new content is published. Set up a campaign, define subject lines, and utilize dynamic tags for personalized content. Adjust delivery options, including timing and segmentation by categories, to effectively engage subscribers. Next, we'll delve into time-based autoresponders. Today, we take a tour of the next type of autoresponders: Action based autoresponders (more... ) --- ### Working with subscriber-based autoresponders - Published: 2015-10-30 - Modified: 2025-04-02 - URL: https://kb.mailster.co/working-with-subscriber-based-autoresponders/ - Categories: Tutorial, Autoresponder, Series - Post series: Auto responder Subscriber auto-responders send automated messages based on user actions like subscription or unsubscription. You can craft personalized welcome emails using tags like {firstname} and {coupon_code}. Set delivery options and enable autoresponder settings to engage new subscribers effectively. Next, we'll explore action-based autoresponders. Today we take a look at Subscriber auto-responders (more... ) --- ### How to add salutation to your subscribers? - Published: 2015-10-10 - Modified: 2025-04-03 - URL: https://kb.mailster.co/how-to-add-salutation-to-your-subscribers/ - Categories: Customization - Tags: subscriber, tags To personalize subscriber greetings, establish custom fields for gender and salutation. Use code snippets to automate salutations based on gender in your Mailster subscriber list. You can also apply these changes to existing users through bulk actions or by adding a custom dynamic tag for flexibility. Sometimes it's needed to welcome your subscribers with friendlier words such as "Hello" or "Hi". In some countries, it's also common to have different salutations based on the user's gender. (more... ) --- ### How can subscribers update their subscription? - Published: 2015-07-08 - Modified: 2025-04-01 - URL: https://kb.mailster.co/how-can-subscribers-update-their-subscription/ - Categories: Customization - Tags: form, profile Enable subscribers to update their data by adding a {profile} tag in your newsletter campaigns. This redirects them to a secure subpage on your homepage where you can customize the editable fields. Ensure your newsletter homepage is properly set up for seamless access. If you would like to allow your subscribers to update their subscription data you can simply add a {profile} tag in your newsletter campaigns. (more... ) --- ### Why does tracking not work? - Published: 2015-06-24 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-does-tracking-not-work/ - Categories: Troubleshoot - Tags: permalinks, tracking If your campaign statistics show no opens or clicks, try sending a test campaign to check links, ensure Mailster isn’t blocked by firewalls, and verify there’s no conflicting “mailster” folder on your server. Remember, subscribers may just be busy, so give it some time. When you send out your campaigns but your statistics claims none of your subscribers opened or clicked your campaign, follow these steps: (more... ) --- ### How to handle bounces with SendGrid? - Published: 2015-06-11 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-to-handle-bounces-with-sendgrid/ - Categories: Settings - Tags: bounce, sendgrid To automatically manage bounces in Mailster using SendGrid, install the SendGrid Integration plugin. Choose SendGrid on the delivery tab to mark future bounces automatically. For Mailster, request SendGrid Support to enable the "preserve headers" option; otherwise, it will overwrite your return-path. Note that the WEB API is incompatible with Mailster's bounce handling. If you are using SendGrid with Mailster you can also automatically progress bounces. You only need the SendGrid Integration plugin from the WordPress Repo your SendGrid account On the delivery tab, you can find two options for handling bounces Select SendGrid and future bounced email addresses will automatically get marked as hard bounced. If you select Mailster you have to contact SendGrid Support and request to enable "preserve headers" option for your account. This step is required otherwise SendGrid will overwrite the return-path of your emails with their own. You cannot use the WEB API when you handle bounces within Mailster! --- ### How to solve database errors? - Published: 2015-05-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/how-to-solve-database-errors/ - Categories: Troubleshoot - Tags: database, mysql, sql If you see an error about missing Mailster tables, visit your update page at https://yourdomain.com/wp-admin/admin.php?page=mailster_update (replace with your domain) to fix it. Alternatively, deactivate and reactivate the plugin to run a database check and create any missing campaigns. In some cases, Mailster is not able to create certain tables in your database. You may end up finding an error similar to Table 'wp_mailster_' doesn't exists Visit the update page to force Mailster to create missing database tables by visiting https://yourdomain. com/wp-admin/admin. php? page=mailster_update Please replace example. com it with your actual domain. This will run the update process, and the problem should be fixed. You can also deactivate the plugin and activate it again afterward. This will run a DB check and create missing campaigns. --- ### How does tracking in Mailster work? - Published: 2014-12-12 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-does-tracking-in-mailster-work/ - Categories: General - Tags: tracking Mailster enables tracking of opens, clicks, unsubscribes, and bounces. It counts opens via a small image loaded from your server; however, some email clients block this image. Clicks are tracked as unique or total, with rates displayed for Click-Through Rate (CTR) and Adjusted Click-Through Rate (ACTR). With Mailster you can track opens, clicks, unsubscribes, and bounces. (more... ) --- ### Choosing your Delivery Method - Published: 2014-12-11 - Modified: 2025-04-02 - URL: https://kb.mailster.co/choosing-your-delivery-method/ - Categories: General, Getting Started - Tags: delivery Mailster offers two default delivery methods: Simple SMTP and SMTP. Simple SMTP is not recommended for bulk mailing due to provider limits. For larger subscriber lists, use SMTP and check with your host for credentials. Additional methods like AmazonSES, SparkPost, Mailgun, SendGrid, and Gmail can be added via plugins. Mailster offers by default two delivery methods: Simple SMTP Additionally, you can add more methods with plugins. Delivery option on the settings page. Simple This is the default method and is not recommended for bulk mailing in general. Often providers limit the number of emails that can be sent with this method to prevent spammers. Talk to your host about the limits and if you are allowed to send emails in bulk. Problems? SMTP This is the method you should use if you have many subscribers. Contact your host for the credentials. SMTP requires certain ports to be open. Problems? AmazonSES Send your Newsletters via AmazonSES SparkPost Send your Newsletters via Sparkpost Mailgun Send your Newsletters via Mailgun SendGrid Send your Newsletters via SendGrid Gmail Send your Newsletters via Gmail --- ### How can I increase the sending speed? - Published: 2014-12-11 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-increase-the-sending-speed/ - Categories: Getting Started, Settings - Tags: delivery To enhance Mailster's email delivery rates, consider reducing the cron interval, increasing the number of emails sent at once, or selecting a different delivery method. Remember, delivery speed averages 1-2 emails per second, and server capacity and connection quality can impact performance. Depending on your delivery method Mailster needs some time to send your campaigns. (more... ) --- ### Why do the links in my emails not work? - Published: 2014-11-14 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-do-the-links-in-my-emails-not-work/ - Categories: Troubleshoot - Tags: links, permalinks If subscribers can't confirm their Mailster subscription or encounter broken links, ensure your permalink structure is set correctly (Settings => Permalink => Save) and verify your server supports redirects. These steps will help resolve issues like "404 - Page not found" errors in your campaigns. In some cases, you were not able to reach the content of one of your links in a Mailster email. (more... ) --- ### How can I use short codes in Mailster campaigns? - Published: 2014-10-30 - Modified: 2025-04-03 - URL: https://kb.mailster.co/how-can-i-use-short-codes-in-mailster-campaigns/ - Categories: Customization - Tags: short code, shortcodes Shortcodes are disabled by default in Mailster to prevent HTML injection that could disrupt emails. Users can enable them in advanced settings, but all registered shortcodes will be removed from the final email. To add custom shortcodes, use the appropriate filter function in the code. Shortcodes are disabled by default in Mailster and will be removed from your campaign. The reason is that short codes can inject almost any HTML, which may break the whole email. (more... ) --- ### SMTP Error: Could not connect to SMTP host. - Published: 2014-10-29 - Modified: 2025-04-03 - URL: https://kb.mailster.co/smtp-error-could-not-connect-to-smtp-host/ - Categories: Troubleshoot - Tags: delivery, error, smtp If you encounter an SMTP connection error, it’s likely due to your email service provider rejecting one of your email addresses. Ensure your "from," "reply-to," and "bounce" addresses match the authenticated SMTP email. Check DNS functionality and connectivity using commands like `dig` and `telnet`. If issues persist, contact your ISP for support. Whenever you get a connection error when sending via SMTP like SMTP connect failed. The most common reason for this problem is that the ESP (Email service provider) you have defined in your delivery settings doesn't accept one of the used email addresses. (more... ) --- ### How can I use Mailster with the wp_mail function? - Published: 2014-10-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/how-can-i-use-mailster-with-the-wp_mail-function/ - Categories: Settings - Tags: delivery, wp_mail Mailster allows you to enhance email delivery by overriding the default wp_mail function. Choose from three settings: bypass Mailster, use it for all emails, or apply a template. Additionally, control how Mailster interacts with third-party content types, ensuring compatibility and effective email delivery. Many contact forms or membership plugins use the wp_mail method. With Mailster you can hijack the function and use the Mailster delivery options to send third-party mail. (more... ) --- ### How can I manually upload Mailster templates? - Published: 2014-10-03 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-manually-upload-mailster-templates/ - Categories: General, Templates - Tags: template, upload Upload templates via FTP if the Templates section isn't suitable. Extract your downloaded archive and place the folder in "wp-content/uploads/mailster/templates" (note: "wp-content" may have a different name). Your template will be available under Newsletter > Templates, with images generated automatically. If you don't like or are not able to upload the templates via the Templates section you can upload the files via FTP. (more... ) --- ### How do I know if my cron is working correctly? - Published: 2014-09-25 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-do-i-know-if-my-cron-is-working-correctly/ - Categories: Troubleshoot, Settings - Tags: cron Mailster requires a cron job to send campaigns. Check its status under Newsletter > Settings > Cron, where you can see the last trigger time and details. If the cron hasn’t run recently, verify your cron settings and ensure the secret hash hasn’t changed. Mailster requires a cron to send its campaign. If you know how to set up a cron you have to check if the cron is running correctly. (more... ) --- ### Why do some of my subscribers get a status of "error"? - Published: 2014-09-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-do-some-of-my-subscribers-get-a-status-of-error/ - Categories: Troubleshoot - Tags: error When sending campaigns, subscribers may be marked as errors due to invalid email addresses, non-existent domains, or server rejections. While these errors are often subscriber-based, Mailster may misclassify some as campaign-based. Common server rejections include reaching sending limits or blacklisted emails. For specifics, consult your email provider. If you're sending your campaigns, you'll sometimes get subscribers marked as errors. (more... ) --- ### How colors work with the Mailster Editor? - Published: 2014-09-09 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-colors-work-with-the-mailster-editor/ - Categories: General - Tags: color, editor Colors in the Mailster Editor are determined by the template's HTML and only recognize 6-digit hex codes (e.g., #FFFFFF). Short hex codes are ignored. When merging colors, use slightly different shades to ensure Mailster can distinguish between them, preventing unintended uniformity. Colors in the Mailster Editor depend on the currently used template. Mailster scans the raw HTML and groups the same colors together. This works only for 6-digit hex colors like #FFFFFF If you're using the short version #FFF Mailster will ignore this color and they cannot get changed via the options panel. Merging Colors If you use the same color for different parts in your template and save it Mailster will only recognize a single color. So changing the background color to #FFFFFF and the text color to #FFFFFF Mailster will not be able to separate them anymore. To prevent that just use slightly different colors like #FFFFFF and #FFFFFE. --- ### Why does the unsubscribe link not work? - Published: 2014-09-04 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-does-the-unsubscribe-link-not-work/ - Categories: Troubleshoot - Tags: links, permalinks Occasionally, unsubscribe links in campaigns may lead to a "404 - Not Found" error. To resolve this, ensure Mailster is activated, permalinks are correctly set, and your server can handle redirects. If issues persist, consult your hosting provider for assistance. In some rare cases, the generated unsubscribe link in your campaigns ends in a "404 - Not Found" page. The same can happen for the confirm, profile link, and sometimes for every link that uses the tracking feature. (more... ) --- ### How can I send newsletters via GoDaddy? - Published: 2014-05-14 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-send-newsletters-via-godaddy/ - Categories: Troubleshoot, Settings - Tags: godaddy, smtp Using GoDaddy's email servers is possible but comes with restrictions. Limit your SMTP sends to 500 emails per account, ensure your from and reply-to addresses match your domain, and configure settings with the specified server details. Be mindful of additional limitations that may apply. Although it's not recommended to use GoDaddy's own email servers, you can do it, but you have to follow some rules: GoDaddy has a limit of 500 emails sent via SMTP from a certain account so make sure you set up the sending limits correctly. You have to make sure the from and reply-to address matches your domain. On the delivery tab, choose "SMTP" and insert the following: Server: relay-hosting. secureserver. net Port: 25 Timeout: 10 Secure Connection: none SMTP Auth: none Username and Password: empty There are also some limitations you may be aware of. --- ### How can I add a captcha to the sign up form? - Published: 2014-04-04 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-add-a-captcha-to-the-sign-up-form/ - Categories: Customization, Extensions - Tags: captcha, form Discover two free plugins for enhanced form security: Mailster Cool Captcha and Mailster reCaptcha™. Both are available on the WordPress Plugin repository, ensuring your forms are protected from spam. Currently are two free plugins available: Mailster Cool Captcha for Forms Mailster reCaptcha™ for Forms You can find them on the WordPress Plugin repo. --- ### How can I setup the newsletter homepage (legacy)? - Published: 2014-01-15 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-setup-the-newsletter-homepage-legacy/ - Categories: General, Getting Started - Tags: frontend, homepage, legacy Mailster requires a static newsletter homepage for subscription management. This page, accessible at http://yourdomain.tld/newsletter-signup, utilizes essential shortcodes for signups, confirmations, and unsubscriptions. Customize your content within the shortcodes, and remember to link it in your settings. Subpages for unsubscribe and profile are also available. There's a newer version available of this article. The newsletter homepage is a static page that is required to make the subscription and unsubscription progress work correctly. If you activate Mailster you'll get asked to create the newsletter homepage during the setup process. By default, it's called "Newsletter" and can be accessed via (more... ) --- ### SMTP Error: Could not authenticate - Published: 2013-12-11 - Modified: 2025-04-03 - URL: https://kb.mailster.co/smtp-error-could-not-authenticate/ - Categories: Troubleshoot - Tags: delivery, smtp Campaigns may pause or fail to send emails due to SMTP authentication errors, incorrect credentials, or blocked ports. Ensure you’re using the correct email for authentication, check your sending limits, and consider changing your delivery method. If issues persist, pause and resume your campaign later. In some cases your campaign pauses or you are even not able to send emails at all cause of this error: SMTP Error: Could not authenticate. Your credentials are incorrect - double-check them! One of your used email addresses is not permitted to use => Use the one you use to authenticate. You probably have reached the sending limits of your provider => Ask your provider or change your delivery method. You are not allowed to send via SMTP => change your delivery method. Some ports are blocked by your provider => Check your ports. You can also try to pause your campaign and resume it after a while if it's a temporary problem. --- ### Can I add attachments to my newsletter? - Published: 2013-12-09 - Modified: 2025-04-03 - URL: https://kb.mailster.co/can-i-add-attachments-to-my-newsletter/ - Categories: General - Tags: attachment Enhance your campaigns by adding attachments via the campaign edit screen, with a total size limit of 1MB (modifiable to 5MB using a filter hook). Be cautious, as large attachments may lead to delivery issues. Consider providing download links for subscribers instead. You can add attachments to your campaigns by using the attachment meta box on the campaign edit screen. You can add any attachment you can upload to your site with a maximum total size of 1MB. You can alter the limit by using this filter hook: add_filter( 'mailster_attachments_max_filesize', function { // Return 5MB return 1024 * 1024 * 5; } ); Keep in mind that attachments can significantly increase your email size and some hosts may reject your mailings. You should also consider sending a link where subscribers can download your files. --- ### Why I can't save templates or other files? - Published: 2013-12-04 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-i-cant-save-templates-or-other-files/ - Categories: Troubleshoot - Tags: filepermission, filesystem, fsdirect Troubleshooting issues with saving templates in WordPress plugins like Mailster can be frustrating. Common causes include permission errors, plugin conflicts, cache problems, JavaScript errors, insufficient server resources, and database issues. Use tools like the Health Check Plugin for easier diagnosis, and follow systematic steps to resolve the problems effectively. When you’re working with WordPress plugins like Mailster, a common frustration is encountering issues with saving templates or other files. Whether you're a seasoned WordPress user or just getting started, these types of errors can be confusing and disruptive. Here's a comprehensive guide to help you troubleshoot and resolve the issue. (more... ) --- ### Why do I get this parse error? - Published: 2013-11-24 - Modified: 2025-04-03 - URL: https://kb.mailster.co/why-do-i-get-this-parse-error/ - Categories: Troubleshoot - Tags: error, parseerror Mailster may display a "parsererror 200" when an Ajax request fails to return valid JSON, often due to third-party plugins or unexpected server outputs. To diagnose the issue, check the developer console for detailed error information. In some rare cases, Mailster shows this error after an Ajax request doesn't respond to a valid JSON: parsererror 200: SyntaxError: JSON. parse: unexpected character This error is often caused by third-party plugins or some unexpected server outputs. Please open the developer console to see the problem with this error. --- ### How can I open the browsers console? - Published: 2013-11-24 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-open-the-browsers-console/ - Categories: Troubleshoot, General - Tags: console, error The Browser Console is essential for tracking JavaScript errors and server-related information. Access it in Chrome (CTRL + SHIFT + J), Safari (CTRL + ALT + I), IE9 (F12), Firefox (CTRL + SHIFT + K), or Opera (CTRL + SHIFT + I) to troubleshoot effectively. The Browser Console contains important information on Errors. While most of the errors shown are JavaScript-related related some server-related information can get displayed as well. (more... ) --- ### Why I'm not able to connect to bounce server? - Published: 2013-11-22 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-im-not-able-to-connect-to-bounce-server/ - Categories: Troubleshoot - Tags: bounce, ports To set up a bounce server, use port 110 or 995 for SSL connections. If you encounter an "Unable to connect" error, your host may be blocking the port. Check the open ports in the Settings => Newsletter => System Info Page for troubleshooting. If you set up a bounce server you have to enter a port. Normally 110 or 995 for SSL connections If you get an "Unable to connect to bounce server! Please check your settings" message during testing the connection your host may block connections to the given port. Please check Settings => Newsletter => System Info Page at the very bottom for open ports. --- ### Why can't I use SMTP? - Published: 2013-11-19 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-cant-i-use-smtp/ - Categories: Troubleshoot - Tags: delivery, smtp SMTP (Simple Mail Transfer Protocol) utilizes various ports (25, 993, 465, 587) for email sending, but providers may block specific ports or restrict use to their own servers. To check port accessibility, visit Settings => Newsletter => System Info. Consider alternative delivery methods or free plugins if ports are blocked. SMTP (Simple Mail Transfer Protocol) uses different ports to send emails. Sometimes your provider blocks specific ports and you're not able to send via SMTP. Some providers also allow only sending via their own SMTP server and block others completely. (more... ) --- ### Mailster is not able to access the file system - Published: 2013-11-18 - Modified: 2025-04-03 - URL: https://kb.mailster.co/mailster-is-not-able-to-access-the-file-system/ - Categories: Troubleshoot - Tags: filepermission, filesystem, fsdirect To resolve Mailster's file system writing issues, adjust your WordPress file permissions or add `define('FS_METHOD', 'direct');` in your wp-config.php. After doing this, dismiss the error message, and it won't reappear if the configuration is correct. On some server configurations, Mailster isn't able to write to the file system. You have to change the file permission for WordPress or force WordPress to use the direct method by adding this line to your wp-config. php: define( 'FS_METHOD', 'direct' ); The error message can be closed (dismissed) after you have added this line. It won't show up again if everything is fine. --- ### How can I setup a cron job? - Published: 2013-11-13 - Modified: 2025-04-03 - URL: https://kb.mailster.co/how-can-i-setup-a-cron-job/ - Categories: General, Getting Started - Tags: cron, cronjob, crontab Ensure your email campaigns are sent correctly by properly setting up your cron. You can use WP-cron for automatic scheduling or opt for a real cron job for more control. Check your host's guidelines for setup and troubleshooting to ensure smooth operation. If you have problems with sending your campaigns you may not have set up your cron correctly. (more... ) --- ### What are my sending limits? - Published: 2013-11-12 - Modified: 2025-04-03 - URL: https://kb.mailster.co/what-are-my-sending-limits/ - Categories: Getting Started - Tags: limits Mailster allows you to customize email sending rates to comply with your provider's limits, typically 1-2 emails per second. Customers can achieve up to 12 emails per second. Avoid sending over 200 emails simultaneously to prevent server timeouts. Always check your provider's specific sending limits. You can define how many emails Mailster sends in a certain period so you can respect your provider's limits. (more... ) --- ### My provider doesn't allow sending bulk mails - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/my-provider-doesnt-allow-sending-bulk-mails/ - Categories: Troubleshoot - Tags: delivery Your provider restricts bulk and outgoing mail. Consider using dedicated email services like SendGrid, Mandrill, Amazon SES, or SparkPost. If Mailster lacks a specific add-on, you can revert to SMTP. Explore free WordPress plugins for various delivery methods. Your provider doesn't allow you to send bulk mail or even block outgoing mail completely. You can always use a dedicated email provider: SendGrid Mandrill Amazon SES SparkPost If Mailster doesn't come with a dedicate add-on for your email provider you can always fall back to SMTP. Please check out the free plugins for available delivery methods on the WordPress repo. --- ### How can I update to the latest version? - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-update-to-the-latest-version/ - Categories: Troubleshoot - Tags: update To update Mailster, visit your WordPress Updates page or enable automatic updates in settings. You can also update via your Freemius account, Composer, or manually from Envato after six months. Ensure to upgrade your license for ongoing automatic updates. The easiest way to update Mailster is like a regular WordPress plugin from the repo. Just visit the Updates page of your WordPress site and update the plugin. If you have "automatic update" enabled in the settings Mailster will get updated automatically. Update the plugin from the Accounts page Once you log into your Freemius account here you can head over to "Downloads" and click th button next to the Mailster plugin. Updating via Composer You can use Composer to install the plugin. Click on the "Composer" button next to the download button to get an install on how to set this up. Update the plugin from Envato If you have bought Mailster via Envato you get 6 months of automatic updates with your Envato license. This means after 6 months you either have to upgrade to one of our plans or upload the package manually. Head over to the download section and find the Mailster Newsletter plugin. Click on "Download" and choose "Installable WordPress file only". Next, go to the plugin section of your site and click on "Plugins" => Add New and click on "Upload Plugin". Once the plugin is updated you will get asked if you like to replace the existing one. Click on "Replace current with uploaded" to continue. That's all! You have successfully replaced the existing version on your site. Enable automatic updates To enable automatic updates you have to upgrade your license. If you have a "Legacy License" you will have 6 months of... --- ### How can I increase my memory limit? - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-increase-my-memory-limit/ - Categories: Troubleshoot - Tags: memory limit Encountering the "Allowed memory size exhausted" error in WordPress indicates the need to increase your PHP memory limit. This guide outlines methods to adjust the memory allocation, including editing wp-config.php, .htaccess, or php.ini files, ensuring your site runs smoothly as it grows. If you get a PHP error like "Allowed memory size of xxx bytes exhausted" you have to increase your memory limit. Increasing the PHP memory limit is a common task for WordPress users, especially when encountering errors or performance issues due to insufficient memory allocation. This article provides a comprehensive guide on how to increase the PHP memory limit in a WordPress environment. (more... ) --- ### The latest cronjob hasn't been finished - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/the-latest-cronjob-hasnt-been-finished/ - Categories: Troubleshoot - Tags: cron, memory limit, timeout Email delays may lead to server timeouts and inaccurate statistics. If you receive a notification, it could be temporary and may resolve itself. For recurring issues, consider increasing your server's memory limit or reducing the number of emails sent at once in newsletter settings. Sometimes sending emails can take longer than expected. This can cause a server timeout and wrong statistics in some cases. You'll get a notification in this case: Also if you're on the cron. php page you get this: If this is a temporary problem and the notification box vanishes by itself you can ignore it but should consider the following things if it happens regularly : Increase your server's memory limit Decrease the emails sent at once at Settings => Newsletter => Delivery You can also calculate your sending limits. --- ### What is the CAN-SPAM act and do my newsletters have to comply? - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/what-is-the-can-spam-act-and-do-my-newsletters-have-to-comply/ - Categories: General - Tags: can-spam, spam The CAN-SPAM Act of 2003, signed by President Bush, established national standards for commercial email in the U.S. It mandates compliance to prevent legal issues with newsletters. Similar laws exist globally, including Canada’s CASL and Australia’s Spam Act, ensuring email marketing adheres to specific regulations. The CAN-SPAM Act of 2003 (15 U. S. C. 7701, et seq. , Public Law No. 108-187, was S. 877 of the 108th United States Congress), signed into law by President George W. Bush on December 16, 2003, establishes the United States' first national standards for the sending of commercial e-mail and requires the Federal Trade Commission (FTC) to enforce its provisions. from Wikipedia (more... ) --- ### How can I prevent that my campaigns went in spam folder? - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-prevent-that-my-campaigns-went-in-spam-folder/ - Categories: Troubleshoot - Tags: spam To avoid spam filters in email campaigns, conduct a spam score test, use a dedicated Email Service Provider (ESP), and authenticate emails with DKIM and SPF. Encourage users to whitelist your address, avoid spammy words, and only send to subscribed users. Follow legal guidelines and utilize Mailster's precheck feature for improvements. The best way to avoid Spam filters when sending email campaigns: Run a spam score test. Don't send with your shared host server, use a dedicated ESP instead. Choose your delivery method. Authenticate your emails by setting up DKIM and SPF for your emails. Ask users to add their email addresses to the address book or a whitelist. Check your subject line/text and avoid words that are used in spam emails. Never send to subscribers who didn't sign up for your newsletter. Also, make sure you follow your local legal guidelines. Run a Precheck Mailster has a built-in option to run a precheck on your campaign which gives you a good overview of what you can improve. Mailster has a built-in Precheck feature An excellent service that gives even better information is mail-tester. com. Run a test by sending the email provided by this service and wait for the result. Don't send with your shared host server, use a dedicated ESP instead If your website is hosted on a shared server many other users are also hosted on the same server with the same IP address. If others send emails through this server and their emails get marked as spam your emails also get marked as spam more easily. This happens because the IP address of your server gets listed on blacklists. To prevent this go with a private server or send your emails from a dedicated server. Even better is to use a professional service as explained here. Authenticate your outgoing... --- ### Mailster doesn't work with [third party plugin] - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/mailster-doesnt-work-with-a-third-party-plugin/ - Categories: Troubleshoot - Tags: third party plugin Mailster aims for compatibility with popular plugins by adhering to WordPress Coding Standards. If issues arise, follow our debugging guide: disable plugins to identify conflicts and test with the default WordPress theme to rule out theme-related problems. We do our best to keep Mailster working best with the most common plugins by following the WordPress Coding Standards but sometimes Mailster or a third-party plugin breaks caused by the other. (more... ) --- ### How can I customize the notification template? - Published: 2013-11-10 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-can-i-customize-the-notification-template/ - Categories: Customization - Tags: notification template, template Mailster allows you to customize notification emails using the campaign editor. Create a new campaign, select the notification template, and edit content while retaining essential tags. Save the new template, ensuring it’s stored correctly. For FTP edits, access the templates folder in wp-content/uploads/mailster, but avoid modifying plugin folder files. Mailster uses the notification template file of your template to send certain emails. You can change this template with the campaign editor. (more... ) --- ### How do I export my subscribers? - Published: 2013-11-08 - Modified: 2025-04-02 - URL: https://kb.mailster.co/how-do-i-export-my-subscribers/ - Categories: General - Tags: export Easily export your subscribers from the "Manage Subscribers" page by selecting the "Export" tab. Choose your lists, set conditions, and specify the status to filter your audience. Define the fields and their order, then export as an Excel or CSV file, with settings saved for future use. You can export your subscribers on the "Manage Subscribers" page. (more... ) --- ### Why are my auto responders not getting send? - Published: 2013-11-07 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-are-my-auto-responders-not-getting-send/ - Categories: Troubleshoot - Tags: autoresponder Setting up a custom autoresponder can be challenging. If you're facing issues, check that your campaigns are active, emails can be sent from WordPress, conditions are met, the set time has elapsed, and your cron jobs are functioning properly. To set up your custom autoresponder can take some time and even then you may have trouble getting things going. Please check the following points if you have troubles with your autoresponders: (more... ) --- ### Changelog - Published: 2013-11-07 - Modified: 2025-04-04 - URL: https://kb.mailster.co/changelog/ - Categories: Developer - Tags: changelog Version 4.1.10 enhances the capabilities and permissions system, improves error handling in form blocks, and refines homepage editing controls. Previous updates addressed various bugs and added features like new workflow capabilities and improved translations, ensuring a more robust user experience and streamlined functionality. Version 4. 1. 10 2025-03-10 fixed: improve capabilities and permissions system updated Dependencies and Package Versions chore: update commit message guidelines updated: improve form block error handling updated: refactor homepage block edit and inspector controls Version 4. 1. 9 2013-02-10 fixed: missing capability to delete campaigns in some case fixed: missing key in array function added: new capabilities delete_private_newsletters, delete_published_newsletters improved: alignment of elements in the automation inspector improved: use ToggleGroupControl on update custom field action for checkboxes package upgrades Version 4. 1. 8 2025-01-07 fixed: bug when subscribe on multiple lists. 'wpdb->delete' may return 0 so do better checks removed redundant shortcode updated packages Version 4. 1. 7 2024-12-17 fixed: issue where activating caused a fatal error if wp_mail is used by another plugin fixed: typo updated: Freemius SDK to 2. 10. 1 Version 4. 1. 6 2024-11-27 fixed: campaigns cache were not cleared on status change fixed: condition using "have" and "doesn't have" tags returned wrong results fixed: force boolean on some expressions added: '__nextHasNoMarginBottom' to components to prevent deprecated messages in WP 6. 7 removed: option to upgrade license from notification updated: dependencies for composer and npm Less use of constant MAILSTER_BUILT Version 4. 1. 5 2024-11-11 improved: admin notices improvements improved: show "0" values on subscriber details page instead of nothing improved: convert license screen improved: option to quickly remove filter from subscriber overview added: {second} tag to display the current second fixed: minor CSS issues fixed: PHP Notice while Autoresponder converting fixed: Trigger selector break blocks if connection is to slow fixed: cache wasn't cleared for block forms in some... --- ### Why my campaigns do not get sent? - Published: 2013-11-07 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-my-campaigns-do-not-get-sent/ - Categories: Troubleshoot - Tags: campaign, cron, delivery, memory limit If your email campaign isn't sending, check key settings: verify newsletter delivery and cron job functionality, ensure server resources are adequate, and confirm you've selected recipients. Additionally, review any potential server issues or conflicts with third-party plugins. For assistance, contact your provider if you hit sending limits. If you have created your campaign and it's ready to get sent you probably see no progress and no mail gets sent. (more... ) --- ### Why I get a "Could not execute:/usr/sbin/sendmail" error message? - Published: 2013-11-07 - Modified: 2025-04-02 - URL: https://kb.mailster.co/why-i-get-a-could-not-execute-usr-sbin-sendmail-error-message/ - Categories: Troubleshoot - Tags: delivery, sendmail, simple Sendmail is a widely used mail transfer client, but ensure the path "/usr/sbin/sendmail" is correct and you have permission to use it, as shared hosts may disable this feature. For bulk mailings, consider using a dedicated email provider or a free WordPress plugin to avoid limits and errors. Sendmail is a mail transfer client that is used by many providers. (more... ) --- ### Where's my purchase code? - Published: 2013-11-07 - Modified: 2025-04-02 - URL: https://kb.mailster.co/where-is-my-purchasecode/ - Categories: General - Tags: license, purchase code To find your Mailster Newsletter Plugin license code from the Envato Marketplace, log in, go to "Downloads," select the plugin, and click the License certificate link. If purchased directly from our website, manage your licenses through our site for easier access. If you bought the plugin via the Envato Marketplace, you can find your license code (purchase code) in the download section at "Download". (more... ) ---