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.
Read more about this topic: SpamAssassin
Famous quotes containing the word methods:
“In inner-party politics, these methods lead, as we shall yet see, to this: the party organization substitutes itself for the party, the central committee substitutes itself for the organization, and, finally, a “dictator” substitutes himself for the central committee.”
—Leon Trotsky (1879–1940)