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Have you by any chance documented your PMG set up? I'm also a very happy Mailcow user and spinning up PMG is something I've been meaning to tackle for years so I can implement archiving with mailpiler, but I've never really wrapped my head around how everything fits together.
There is not much to document on how to set it up. The gui is very intuitive.
You need to setup the relay domains, transports and Options>DNSBL under configuration > mail proxy
Thanks for the response. I really should just dive in, but I’ve got this nagging fear that I’m going to forget about some DNS record that will bork my entire mail service. It good to hear about some working instances that people are happy with.
After you setup the mail gateway you can telnet to port 25 and do the command line mail test and see if mail is delivered to your mail server. After that is confirmed you change your dns mx records.
That’s a great tip. I’d completely forgot you can use telnet for that. Thanks!
Np good luck with the project