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 […]
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 […]
If you bought a license from Envato after the 1st of October 2022 you see an “Expires in…” badge on your account page. This means you will no longer get automatic updates via your WordPress dashboard once the license has expired. You have two options: Upgrade your license Click on “Change Plan” to upgrade your […]
If you encounter problems while sending your campaigns it’s most likely a problem with your cron setup.
If you ever experienced this problem that your WordPress site redirects you to https://yoursite.com/wp-admin/post.php it may be caused by false settings in your mod_security the module on your server.
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 […]
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.
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.
Technically there are no limits in Mailster. You can have unlimited subscribers, lists, forms, and campaigns. There are some server-related limits though.
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 signup for a newsletter.
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 […]
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.
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.
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 Mailster isn’t working correctly.
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 […]
Mailster has been tested thoroughly and follows the WordPress Coding Standards. This means it should work with every plugin or theme which also follows those standards. If you experience any issue it’s often caused by a third-party plugin or your current theme.
WordPress gets constantly updated and every update brings new features and fixes bugs. Will the plugin no longer work with a WordPress version that is no longer supported? No, if the plugin worked in the past it will most likely work in the future. Sometimes features not available in this version will cause an error that […]
When you send out your campaigns but your statistics claims none of your subscribers opened or clicked your campaign, follow these steps:
In some cases, Mailster is not able to create certain tables in your database. You may end up finding an error similar to Visit the update page to force Mailster to create missing database tables by visiting Please replace example.com it with your actual domain. This will run the update progress and the problem should be fixed. […]
In some cases, you were not able to reach the content of one of your links in a Mailster email. The confirmation link isn’t working If your subscribers cannot confirm their subscription please check One link in a campaign isn’t working The links in a campaign get remapped for tracking purposes. If you’re reaching a […]
Whenever you get a connection error when sending via SMTP like 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. Change the from-address, the reply-to, and the bounce address to the email you use to […]
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 actually running correctly.
If you’re sending your campaigns you’ll get sometimes subscribers marked as error
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 which uses the tracking feature. Make sure If you have Mailster activated the first thing you should do is reset your permalink […]
Although it’s not recommended to use GoDaddy’s own email servers you can do it but have to follow some rules: GoDaddy has a limit of 250 emails from a certain account so make sure you set up the sending limits correctly. Use this form to calculate your values. You have to make sure the used […]
In some cases your campaign pauses or you are even not able to send emails at all cause of this error: You can also try to pause your campaign and resume it after a while if it’s a temporary problem.
It looks like your WordPress installation isn’t able to write files. You have to change the file permission to the upload folder located in wp-content/uploads and to all, its subfolders. Read more about file permissions on the WordPress site: Changing File Permissions. You can also force WordPress to write files with FS_DIRECT.
In some rare cases, Mailster shows this error after an ajax request doesn’t respond to a valid JSON: 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.
The Browser Console contains important information on Errors. While most of the errors shown are JavaScript related some server-related information can get displayed as well. Chrome: Alternative method: Note: In Chrome’s dev tools, there is a “console” tab. However, a smaller “slide-up” console can be opened while any of the other tabs are active. Safari: Note: […]
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 […]