smtp – Mailster Knowledge Base

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 […]

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 […]

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 […]

Send your Newsletters via Mailgun

Mailgun is a developer friendly email provider and if you use Mailster you can use them to send your campaigns.

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 […]

How can I send newsletters via GoDaddy?

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 mails from a certain account so make sure you setup the sending limits correctly. Use this form to calculate your values. You have to make sure the used from […]

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