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Answer: Yes. There is the mm-handler method described in the official Mailman Installation documentation at <http://www.list.org/mailman-install/node33.html;, but not everyone wants to go that shared system-wide route. As one alternative, Ed Greenberg posted a message to the mailman-users mailing list on using the same technique for integration with sendmail as is currently used in integrating with postfix. See <http://mail.python.org/pipermail/mailman-users/2004-June/037518.html; for details.
Hopefully we'll be able to convince him to upload this patch to SourceForge and get this incorporated into a future version of Mailman.
Tony Lembke has posted some even more detailed instructions at <http://mail.python.org/pipermail/mailman-users/2007-December/059693.html;.
Geoff Allen has posted a different approach that uses cron to run Mailman's genaliases and put the result in a sendmail alias file. See <http://mail.python.org/pipermail/mailman-users/2008-March/060974.html;. Note that the following line was wrapped in the original post. It should be all one line as here.
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