Hi, not an answer just a question about your solution...I'm trying to follow your guidelines but still unsuccessful. I've configured the following values:
mail.bounce.alias = monitor
mail.catchall.domain = mydomain.com
Then I created an Incoming Mail Server, with the account: monitor@mydomain.com.
So when I reply a mass mailing email, I get the following error: ValueError: No possible route found for incoming message from Cesar <cesar@mydomain.com> to Administrator <monitor@mydomain.com> (Message-Id <8762eb84-8da7-1c66-798b-9171db8fbcf9@mydomain.com>:). Create an appropriate mail.alias or force the destination model.
And when I get a bounce I get this another error: Routing mail with Message-Id <20190106035954.44910E0153@smtp.relay.mydomain.com>: not routing bounce email from MAILER-DAEMON (Mail Delivery System) to monitor@mydomain.com
Hope you kindle provide me an advice about my config?
Thanks in advance!