I have an hMailServer installation on a Windows 2012 server VM and need to properly set up reverse DNS + the mail server in order to avoid getting e-mails bounced back from certain big providers, which started to check this recently.
My server provider allows to set one rDNS entry, however I'm hosting several domains. So, I wonder what to set there and how to configure hMailServer.
There is a Default domain setting in the Advanced settings, but the help says this is only used for user which log in without an explicit domain. So, how can I configure hMailServer to use always the domain I set for rDNS?