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
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“It would be some advantage to live a primitive and frontier life, though in the midst of an outward civilization, if only to learn what are the gross necessaries of life and what methods have been taken to obtain them.”
—Henry David Thoreau (1817–1862)