[TriLUG] Spam help

[Chris Knowles]

As usual, I come to you in a moment of need.

I'm tired of getting spam at work.  (At home I use SpamAssassin.)

The problem being that....

1) we use Exchange server, and can't move off of it yet.
2) we have no money to spend.

So I have been looking around, and there are some tantalizing hints
about using a Linux post to filter e-mail on it's way to the Exchange
server.

Unfortunately, I need more than a few hints.  Can anyone give me some
direction on doing this?  Web links, books, and descriptions are all
appreciated.

I prefer postfix, but with more direction, I can probably figure out
sendmail.

Thanks in advance.

CJK