SpamAssassin
Features :
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
server.
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
user-agent application.
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