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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