- Patrick Ben Koetter p@state-of-mind.de:
From my daily work with mailman the following "modified in some way"-tasks come to my mind immediately:
- apply client and content policy that differs from the port 25 anti-spam policy
- add DKIM signatures because it is clear mailman messages are ORIGINATING from our network
I seem to remember a certain training where the two of us were showing some very different ways on how to deal with individual policies ;-)
I don't think changing the default port would be such a great idea. The submission port is widely used for messages submitted by _end users_ - with all the necessary precautions in place, i.e. DNS checks, SMTP AUTH and content filtering (at least virus filtering).
MM generated messages don't need DNS or virus checks - the messages were already scanned when they entered the system, and temporary rejects on DNS errors are detrimental to MM's bounce recognizing abilities. There's a high probability you'd have to create a SMTP listener with a dedicated policy set anyways - changing SMTPPORT in mm_cfg.py is only a very minor task in setting up a mailing list server.
Cheers Stefan