[Mailman-Users] corporate spam filter operation

[Kenneth Porter]

--On Friday, March 21, 2008 8:50 PM -0400 Matt Morgan 
<minxmertzmomo at gmail.com> wrote:

> Are there corporate, enterprise spam-killing services that work on a
> user-by-user basis, rather than a message-by-message basis? For example,
> where the same message, sent to a few different people, might be rejected
> as spam for one recipient but not others?

There's Can-It:

<http://www.roaringpenguin.com/>

The free open source code that it's based on is MIMEDefang:

<http://mimedefang.org/>