SpamAssassin - Network-based Filtering Methods

Network-based Filtering Methods

SpamAssassin also supports:

  • DNS-based blackhole lists and DNS-based whitelists
  • URI blacklists such as SURBL or URIBL.com which track spam websites
  • checksum-based filters such as the Distributed Checksum Clearinghouses, Vipul's Razor and the Cloudmark Authority plug-in (commercial)
  • Hashcash email stamps based on proof-of-work
  • Sender Policy Framework and DomainKeys Identified Mail

More methods can be added reasonably easily by writing a Perl plug-in for SpamAssassin.

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