I have written and tested a script that filters spam email based on
the 'X-Spam-Flag' in the header. In the month that I have been using
it, 904 messages have been filtered out!  Of this, only 4 messages I
*could* have been interested in, 3 from a merchant I have done
business with, and 1 piece of mailing list mail.

This script is designed for people who use the 'inc' command
at an athena% prompt. It might be able to be adapted for other
circumstances (such as xmh or exmh), but I don't use those. 
It doesn't delete the spam, only puts it into a different folder
so you don't have to look at it.

It also assumes that you use normal defaults, such as your mail
normally goes into your "inbox".

To use this, type the following:

mkdir ~/Mail/unfiltered
mkdir ~/Mail/spamfolder
add karen
cp /mit/karen/public/filtered-inc ~/
chmod 755 ~/filtered-inc
alias inc ~/filtered-inc

You will then need to edit your ".cshrc.mine" file, and add a line
as follows (this gets run when you log in):

alias inc ~/filtered-inc

Feel free to share, modify, etc.

Karen