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.
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Bill Cole
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