Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!bu-cs!purdue!decwrl!sun!pitstop!sundc!seismo!uunet!mcvax!cernvax!ethz!solaris!wyle
From: wyle@solaris.UUCP (Mitchell Wyle)
Newsgroups: comp.mail.misc
Subject: Re: Filtering junk mail
Summary: elm filter MailFilter
Keywords: filter mailfilter e-mail
Message-ID: <495@solaris.UUCP>
Date: 16 Dec 88 10:49:11 GMT
References: <79561@sun.uucp> <1988Dec2.154739.3368@ateng.ateng.com>
Reply-To: wyle@inf.ethz.ch (Mitchell Wyle)
Followup-To: comp.mail.misc
Organization: Informatik Dept. ETH Zuerich
Lines: 19

I've been running a scheme similar to elm's filter program for
a few years which does what you want.  It's a bunch of shell 
scripts and a "rule-base" of pattern-action rules.  Incoming
mail is .forwarded through the "inference" engine at delivery
time.

I have an un-published paper about it; the abstract:

A rule based system performing user-specific pre-defined actions on
electronic mail messages is presented.  The system screens, forwards,
saves, and processes certain in-coming messages when they arrive at a
user's mailbox.  The mail filter model, algorithm and implementation
are presented with examples illustrating its utility.

E-mail me if you want more info.
-- 
-Mitchell F. Wyle                         wyle@ethz.uucp
Institut fuer Informatik                  wyle@inf.ethz.ch
ETH Zentrum / 8092 Zurich, Switzerland    +41 1 256 5237