When emails are relayed via the MailMan system, the multipart tags result in an extra part containing just the MailMan signature, which seems un-necessary.
EXAMPLE:
------=_Part_26224_2463088.1190786011290
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
[[ORIGINAL EMAIL MESSAGE]]
------=_Part_26224_2463088.1190786011290
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
[[MAILMAN LIST NAME]]
[[MAILMAN LIST ADDRESS]
http://\[[MAILMAN URL]]
------=_Part_26224_2463088.1190786011290--
Logged In: YES
user_id=1123998
Originator: NO
Yes, it seems unnecessary, but it's not. See <http://www.python.org/cgi-bin/faqw-mm.py?req=show&file=faq04.039.htp>.