Apache SpamAssassin

Apache SpamAssassin
Developer(s)Apache Software Foundation
Initial releaseApril 20, 2001 (2001-04-20)
Stable release
4.0.1  / 29 March 2024 (29 March 2024)
RepositorySpamAssassin Repository
Written inPerl, C
Operating systemCross-platform
TypeSpam filter
LicenseApache License 2.0
Websitespamassassin.apache.org 

Apache SpamAssassin is a computer program used for e-mail spam filtering. It uses a variety of spam-detection techniques, including DNS and fuzzy checksum techniques, Bayesian filtering, external programs, blacklists and online databases. It is released under the Apache License 2.0 and is a part of the Apache Foundation since 2004.

The program can be integrated with the mail server to automatically filter all mail for a site. It can also be run by individual users on their own mailbox and integrates with several mail programs. Apache SpamAssassin is highly configurable; if used as a system-wide filter it can still be configured to support per-user preferences.