Howtoforge posted a tutorial about setting up an Ubuntu Jeos based server as a spamfilter in gateway mode
This tutorial shows how to set up an Ubuntu Jeos 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 Baruwa.The Perfect SpamSnake - Ubuntu Jeos 12.04 LTS Precise Pangolin
