SpamAssassin Concepts, pt.2

• Combines many systems for a "broad-spectrum" approach:

  • Detect forged headers
  • Spam-tool signatures in headers
  • Text keyword scanner in the message body
  • DNS blacklists
  • Razor, DCC (Distributed Checksum Clearinghouse), Pyzor

• Spammers cannot aim to defeat 1 system; the others will catch them out