Rupture has SpamAssassin You can use it to kill SPAM. Beware, it is not the easiest thing in the world. You will need a bit of UNIX knowledge (running commands) and a bit of general savvy (Internet, Email terms and ideas). However, it can be a boon to you if you put some time into it.

You can read about the project at its website.

Then, read Rupture SpamAssassin Introduction.

Then, read Rupture SpamAssassin Setup Instructions.

You can also see yesterday's Rupture SPAM Stats Report.

Feel free to email the admin with any specific questions etc.