[MM3-users] Re: Loops back to myself

Thank you for your message!

The docs say "[s]etting relay_domains means Postfix will start to accept mail for newly added domains even if they are not part of mydestination" -- are you suggesting I should put my list (sub)domains in mydestination in my postfix config instead? Otherwise, as I understand it (big caveat!), that's exactly what *does* cause this problem; postfix doesn't think it handles the domain so it routes it externally but the MX records point it back to itself.

I'm wary of borking a working system that's so busy, so I'll see if I can set up an environment to test this.

I would prefer to reject mail appropriately with the correct code if possible.