MegaBrutal via Mailman-users writes:

 > What I found out is that the second address must match the pattern
 > "Some Name" <[email protected]>. The e-mail is properly formatted
 > when it gets into Mailman, but when it is sent out to list members,
 > it gets malformed to [email protected].

This looks more like the kind of thing that an MTA sometimes does,
rather than Mailman.  Mailman does not modify addresses ever as far as
I know, although in some cases it will substitute a different, fixed
address for the original one in the message.  (The three cases I know
of are rewriting From to contain the list address for anonymous lists
and DMARC mitigation, and it can be configured to substitute a fixed
address in Reply-To.)  Mailman doesn't do the kind of editing you
describe, as far as I'm aware.

Is example.com your domain?  If you can look at the MTA configuration
for that domain, check for address rewriting in the configuration.

The easiest way to test it is to install the Mailhog application on
the same host as Mailman, then configure Mailhog to send to the same
SMTP gateway as Mailman, and configure Mailman to send to localhost
and the Mailhog port.  Mailhog will then capture Mailman's outgoing
mail, you can check it in Mailhog's queue directory.  Then you can
release any non-test emails from Mailhog.  If the messages captured by
Mailhog show the problem, then it's probably Mailman.

You can also get the same effect by just shutting down the MTA, and
looking at the message in Mailman's 'out' queue (or perhaps the MTA's
'in' queue for some MTAs).  But that would affect all incoming and
outgoing mail, not just Mailman.


-- 
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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