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? 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.

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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