dap1--- via Mailman-users writes:

 > I don't have a static IP and don't want to pay for one or change my
 > ISP. I've had my email address for far too many years to change it
 > now.

Are you saying your Mailman list-post mailbox is your personal
mailbox, perhaps using an mailbox+listname extended address to
distinguish list traffic from personal mail?  And you're distributing
via Mailman to third parties as well as back to yourself?

And while you're answering questions, how about showing us the
>From header?

Really, you need to stop trying to diagnose the problem yourself
("must be Mailman, Postfix, or fetchmail") -- we're just going to
ignore that -- and start giving us some facts to work with.

-- 
GNU Mailman consultant (installation, migration, customization)
Sirius Open Source    https://www.siriusopensource.com/
Software systems consulting in Europe, North America, and Japan
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