I’ve set Mailcow up on my server with the following relevant records created for it:
In my setup, I have MAILCOW_HOSTNAME=mail.nightfirec.at
and ADDITIONAL_SAN=autoconfig.nightfirec.at,autodiscover.nightfirec.at
set.
When testing mail sending with mail-tester, the only significant issue it finds is that my reverse DNS does not match my sending domain. In this case, rDNS on my server’s IP address yields nightfirec.at
, but the mail is sent from mail.nightfirec.at
(despite having created the nightfirec.at
domain within Mailcow, and sending from an @nightfirec.at
address). How should this be addressed so they match?