SpamAssassin is an Open Source project available at spamassassin.org

We currently tag all mail using SpamAssassin. Once the mail is tagged you can use procmail or another filter device to move spam to another folder. To use procmail, you can add the following to your .procmailrc near the top (so it gets run before other recipes):

# Move high scoring spam to "probably-spam" folder
:0:
* ^X-Spam-Score: [0-9\.]* .\*\*\*\*\*
probably-spam

If you use another filtering system besides procmail to filter your mail, then you can use that filtering system to match on the same message headers.

More documentation on Spam Assassin can be found on their website.

• .procmailrc that uses spamassassin results to move messages