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Apache SpamAssassin
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==Network-based filtering methods== Apache SpamAssassin also supports: * [[DNSBL|DNS-based blacklists]] and [[DNSWL|DNS-based whitelists]] * Fuzzy-checksum-based spam detection filters such as the [[Distributed Checksum Clearinghouse]], [http://razor.sourceforge.net/ Vipul's Razor] {{Webarchive|url=https://web.archive.org/web/20130328202325/http://razor.sourceforge.net/ |date=28 March 2013 }} and the Cloudmark Authority plugins (commercial) * [[Hashcash]] email stamps based on [[Proof-of-work system|proof-of-work]] * [[Sender Policy Framework]] and [[DomainKeys Identified Mail]] * [[URI]] blacklists such as [[SURBL]] or [https://URIBL.com URIBL] which track spam websites More methods can be added reasonably easily by writing a Perl plug-in for Apache SpamAssassin.
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