What is SpamAssassin?

Wiki MarkupSpam{{`Assassin is a mail filter to identify spam. It is an intelligent email filter which uses a diverse range of tests to identify unsolicited bulk email, more commonly known as \["Spam"\]. These tests are applied to email headers and content to classify email using advanced statistical methods. In addition, Spam}}`Assassin has a modular architecture that allows other technologies to be quickly wielded against spam and is designed for easy integration into virtually any email system.

Want to learn more?

• Questions about using SpamAssassin can be asked on the SpamAssassin-Users MailingLists. However, please note AskingAboutIntegrations.
• BooksAboutSpamAssassin: Published books that discuss SpamAssassin.

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• Header tests
• Body phrase tests. For more information, see SpamAssassinRules.
• Bayesian filtering (BayesFaq)
• Automatic address whitelist/blacklist (AutoWhitelist)
• Automatic sender reputation system (TxRep)
• Manual address whitelist/blacklist (ManualWhitelist)
• Collaborative spam identification databases (DCC, Pyzor, Razor2); See NetworkTests UsingNetworkTests.
• DNS Blocklists, also known as "RBLs" or "Realtime Blackhole Lists". See DnsBlocklists
• Character sets and locales

Wiki MarkupEven though any one of these tests might, by themselves, mis-identify a \["Ham"\] or \["Spam"\], their combined score is terribly difficult to fool.

About the Apache Software Foundation

SpamAssassin is an Apache Software Foundation project and is released under the Apache License. The Apache Software Foundation provides organizational, legal, and financial support for a broad range of open source software projects. As a US 501(c)(3) public charity, the Foundation provides an established framework for contributions of both intellectual property and funding for the support of open source software development. Through a collaborative and meritocratic development process, Apache projects deliver enterprise-grade, freely available software products for the public benefit, attracting large communities of users and enabling future innovation, both commercial and individual, through its pragmatic Apache License.CategoryDefinition