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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]], [
* [[Hashcash]] email stamps based on [[Proof-of-work system|proof-of-work]]
* [[Sender Policy Framework]] and [[DomainKeys Identified Mail]]
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==Licensing==
Apache SpamAssassin is [[free software|free]]/[[open source software]], licensed under the [[Apache License|Apache License 2.0]]. Versions prior to 3.0 are dual-licensed under the [[Artistic License]] and the [[GNU General Public License]].
Many commercially available anti-spam packages integrate SpamAssassin as part of their products, such as SpamKiller by [[McAfee]] and [[Kerio MailServer]] by Kerio.<ref name="Hong">{{cite book |last1=Hong |first1=Bryan |title=Building A Server with FreeBSD 7: A Modular Approach |date=2008 |publisher=No Starch Press |___location=San Francisco |isbn=9781593271459 |page=197 |edition=1st}}</ref>
==sa-compile==
<code>sa-compile</code> is a utility distributed with Apache SpamAssassin that compiles a SpamAssassin ruleset into a [[deterministic finite automaton]] that allows Apache SpamAssassin to use processor power more efficiently.
==Testing
Apache SpamAssassin is designed to trigger on the [[GTUBE]], a 68-byte string similar to the antivirus [[EICAR test file]]. If this string is inserted in an RFC 5322 formatted message and passed through the Apache SpamAssassin engine, Apache SpamAssassin will trigger with a weight of 1000.
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[[Category:Free email software]]
[[Category:Free software programmed in Perl]]
[[Category:Anti-spam]]
[[Category:Anti-spam server softwares]]
[[Category:Spamming]]
[[Category:Email-related software for Linux]]
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