[ Thanks to Falko
Timme for this link. ]
“This tutorial shows how to set up an Ubuntu Hardy Heron (8.04
LTS) based server as a spamfilter in Gateway mode. In the end, you
will have a SpamSnake Gateway which will relay clean emails to your
MTA. You will also be able to view your incoming queue, train your
SpamSnake and carry out a few more advanced operations via
MailWatch…”