Dennis Putnam via Postfix-users: Checking application/pgp-signature: FAILURE -- Start of PGP signed section. > On 12/6/2025 2:49 PM, Bill Cole via Postfix-users wrote: > > On 2025-12-06 at 13:27:19 UTC-0500 (Sat, 6 Dec 2025 13:27:19 -0500) > > Dennis Putnam via Postfix-users <[email protected]> > > is rumored to have said: > > > >> I'm implementing Mailman 3 on Utuntu 24.04. The problem is that my > >> ISP munges the outgoing from addresses from mailman. I am trying to > >> set up a different relay host for outgoing mail from mailman. Other > >> mail can go through my ISP relay by default. > >> > >> What triggers postfix to use which relay? > > > > The transport map. See the man page for transport(5) for all the details. > > > >> My current configuration only goes through my ISP and nothing goes > >> through the alternate relay. I assume I would have to use some header > >> from mailman to implement that trigger. > > > > Since the envelope sender used by Mailman is idiosyncratic, you can > > use sender_dependent_relayhost_maps, documented in the man page for > > postconf(5). > > > >> > >> I know how to configure a relay host but it is the answer to that, > >> that has me at a standstill. > >> > >> I would appreciate any help resolving this issue. > >> _______________________________________________ > >> Postfix-users mailing list -- [email protected] > >> To unsubscribe send an email to [email protected] > > > > > Hi Bill, > > Thanks for the reply but I don't see how this helps. It seems that > triggering the relay is based on the "to" header domain. I don't see how > to trigger it based on something like the list owner or reply-to header. > It is not practical to add the domain of each list member in the > transport map. What am I missing?
sender_dependent_relayhost_maps uses the envelope sender address, i.e. the bounce address in mailman outbound messages. With the postfix-users list that address is '[email protected]'. Postfix logs that address like this postfix/qmgr[PID]: QUEUEID: from=<[email protected]>, ... It is distinct from other email. Wietse Wietse _______________________________________________ Postfix-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
