Below is the simple guide on how to configure Zimbra MTA (version 8.5 or later) to send outgoing emails using your SMTP2GO’s SMTP Server.
Login to your server via SSH as ‘root’ user. We recommend to do the following steps as zimbra user.
Setting a relay host: Change the relay host to mail.smtp2go.com followed by port 2525 (8025, 587 and 25 can also be used).
Enabling SMTP authentication: Create a text file with the username/password. Replace USERNAME with your SMTP2GO Username and PASSWORD with your SMTP2GO password.
Create a postfix lookup table:
To test that the lookup table is correct, the following command should return the USERNAME:PASSWORD
Configure postfix to use the new password map:
Configure postfix to use SSL authentication:
Configure postfix to use the outgoing server name rather than the canonical server name:
Enable to use TLS:
Enable Plaintext Authentication: Remove the noplaintext option to enable the plaintext authentication:
The latest update on configuration will be reflected automatically within 2 minutes.
Note: If you see an error ‘550 unable to verify sender address’ when trying to send an email after setting up, this means your ‘From’ email address doesn’t have a valid MX record setup yet. All emails must be sent from an email address that has an MX record at its domain name.
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