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?
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