How to deal with “Reverse DNS does not match SMTP Banner” on a Virtualmin Postfix server

On a newly installed control panel you might have this situation:


Client domain:

This might cause problems with MX Toolbox’s health check here:

The lines in to look at are:

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)

myhostname =

mydestination = $myhostname,,, , localhost,

Change myhostname to the correct banner to avoid this issue.

Also make sure the reverse DNS is set up properly.

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