SMTP Error: Could not connect to SMTP host.

Whenever you get a connection error when sending via SMTP like SMTP connect() failed. The most common reason for this problem is that your ESP (Email service provider) you have defined in your delivery settings doesn’t accept one of the used email addresses. Change the from, the reply-to and the bounce address to the email […]

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SMTP Error: data not accepted

This error occurs if you’re sending via SMTP. The SMTP server rejects the mail for several reasons: Your server dosen’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 […]

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SMTP Error: Could not authenticate

In some cases your campaign pauses or you even not able to send mails at all caused by this error: SMTP Error: Could not authenticate. Your credentials are incorrect – double check them! One of your used email addresses are not permitted to use => Use the one you use to authenticate. You probably have […]

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Why I get a “Could not execute: /usr/sbin/sendmail” error message?

Sendmail is a mail transfer client which is used on many providers Make sure the the path “/usr/sbin/sendmail” is correct Make sure you have the permission to send with sendmail (ask provider for help). Shared hosts often disabled this function. Try a different sending method at Settings => Newsletter => Delivery Sendmail isn’t designed for […]

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How can I increase the sending speed?

Depending on your delivery method Mailster needs some time to send your campaigns. If you like to increase your delivery rate you can do try following things: decrease the cron interval trigger the progress faster (How to setup a cron) Increase the “numbers of mails sent at once” on the Delivery tab in the settings Choose a […]

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How can I use Mailster with the wp_mail function?

Many contact-form 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 mails. On the General tab in the settings you can find three options: 1) Do not use Mailster for outgoing WordPress mails This option will bypass the functionality and uses […]

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Why can’t I use SMTP?

SMTP (Simple Mail Transfer Protocol) uses different ports to send mails. Sometime your provider block specific ports and you’re not able to send via SMTP. Some providers also allow only sending only via their own SMTP server and block others completely. The most common ports are 25, 993, 465, 587 for outgoing SMTP connection. To […]

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My provider doesn’t allow sending bulk mails

Your provider doesn’t allow you to send bulk mails or even block outgoing mails completely. You can always use a dedicate email provider: SendGrid Mandrill Amazon SES SparkPost Please check out the free plugins for available delivery methods on the WordPress repo

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Choosing your Delivery Method

Mailster offers by default three delivery methods: Simple SMTP Gmail Additionally you can add more methods with plugins. Simple This is the default method and is not recommended for bulk mailing in general. Often providers limit the amount of mails which can be sent with this method to prevent spammers. Talk to your host about […]

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