[Mailman-Users] Changing the from email address

That's exactly the envelope sender address that should be used for
sending the messages. Otherwise, all bounces would come in to the
list and be redistributed to all the other recipients, which would
cause another set of bounces, ad infinitum.

I suggest you read the Mailman documentation and FAQ.

Is this your Mailman installation or Dreamhost's?


The envelope sender is listname-bounces so automated bounce processing
can work. If you change this (assuming you can - it requires patching
Mailman), bounces will be returned to the list.

Mailman also sets the Sender: header to listname-bounces. You can
probably change this without affecting bounce processing except for
some non-compliant MTAs, but this too requires patching.

See
<http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq02.003.htp>.