mhonarc -nomailto -spammode -nourl -reconvert -rcfile blah.rc -nodoc -idxfname index.html /var/lib/mailman/archives/private/test.mbox/test.mbox
<EXCS>
list-</EXCS>

While I was at it I gave omega xapian a try. Very nice indeed. Might be a good way to archive my own personal emails.