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:

Hostname: example.ispdomain.com

Client domain: example.com

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

https://mxtoolbox.com/emailhealth

The lines in main.cf to look at are:

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)

myhostname = example.com

mydestination = $myhostname, example.com, localhost.co.za, , localhost, example.ispdomain.com

Change myhostname to the correct banner to avoid this issue.

Also make sure the reverse DNS is set up properly.

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