] TMDA is an open source software application designed to
] significantly reduce the amount of spam (Internet
] junk-mail) you receive. TMDA strives to be more
] effective, yet less time-consuming than traditional spam
] filters. TMDA can also be used as a general purpose local
] mail delivery agent to filter, sort, deliver and dispose
] of incoming mail.

Tom: have you looked at this?

Tagged Message Delivery Agent (TMDA) Homepage