This is the home page for the open-source Apache SpamAssassin
Project. There are also numerous prepackaged versions
for Windows, commercial versions, and specialized front-ends.
If you were sent here because you received an e-mail message which was
modified by SpamAssassin, please read this page.
2011-06-16: SpamAssassin 3.3.2 has been released, a minor new release primarily to support perl-5.12 and later. Visit the downloads page to pick it up, and for more info.
(Older news items can be read at the News and Announcements
page. Atom feed )
Wide-spectrum: SpamAssassin uses a wide variety of local and network
tests to identify spam signatures. This makes it harder for spammers to
identify one aspect which they can craft their messages to work around.
Free software: it is distributed under the same terms and conditions
as other popular open-source software packages such as the Apache web
Easy to extend: Anti-spam tests and configuration are stored
in plain text, making it easy to configure and add new rules.
Flexible: SpamAssassin encapsulates its logic in a well-designed,
abstract API so it can be integrated anywhere in the email stream.
The Mail::SpamAssassin classes can
be used on a wide variety of email systems including procmail,
sendmail, Postfix, qmail,
and many others.
Easy Configuration: SpamAssassin requires very little configuration;
you do not need to continually update it with details of your mail
accounts, mailing list memberships, etc. Once classified, site and
user-specific policies can then be applied against spam. Policies can be
applied on both mail servers and later using the user's own mail