mail/spamassassin 4.0.2nb2 NetBSD

SpamAssassin is a mail filter to identify spam. It will examine each message presented to it, and assign a score indicating the likelihood that the mail is spam.

It applies a wide range of heuristic tests on mail headers and body text to identify "spam", also known as unsolicited commercial email. The mail can then be optionally tagged as spam for later filtering.

The spam-identification tactics used include header analysis, text analysis, a Bayesian-style form of probability-analysis classification and DNS blacklists. It also includes plugins to support reporting spam messages to collaborative filtering databases such as Pyzor, DCC, and Vipul's Razor.

The distribution provides a command line tool to perform filtering, along with a set of perl modules which allows SpamAssassin to be used in a variety of different spam-blocking scenarios.

In addition, "spamd", a daemonized version of SpamAssassin which runs persistently, is available. Using its counterpart, "spamc", a lightweight client written in C, an MTA can process large volumes of mail through SpamAssassin without having to fork/exec a perl interpreter for each message.

SpamAssassin does not deliver mail to the users mailbox. You need a different program (procmail is recommended) for local mail delivery.