It is released under the Apache License 2.0 and is now part of the Apache Foundation.
The program can be integrated with the mail server to automatically filter all mail for a site.
Mason rewrote all of Jeftovic's code from scratch and uploaded the resulting codebase to Source on April 20, 2001.
In summer 2004 the project became an Apache Software Foundation project and later officially renamed to Apache Spam Assassin.
It can be run as a standalone application or as a subprogram of another application (such as Milter, SA-Exim, Exiscan, Mail Scanner, MIMEDefang, Amavis) or as a client ().
The client/server or embedded mode of operation has performance benefits, but under certain circumstances may introduce additional security risks.
It can also be run by individual users on their own mailbox and integrates with several mail programs.
in CPAN) which is usually used to filter all incoming mail for one or several users.
Spam Assassin is a computer program used for e-mail spam filtering.
Spam Assassin uses a variety of spam-detection techniques, including DNS-based and fuzzy-checksum-based spam detection, Bayesian filtering, external programs, blacklists and online databases.
Typically either variant of the application is set up in a generic mail filter program, or it is called directly from a mail user agent that supports this, whenever new mail arrives.
Spam Assassin was awarded the Linux New Media Award 2006 as the "Best Linux-based Anti-spam Solution".
Spam Assassin was created by Justin Mason, who had maintained a number of patches against an earlier program named by Mark Jeftovic, which in turn was begun in August 1997.