Description:

SpamAssassin provides you with a way to reduce if not completely
eliminate Unsolicited Commercial Email (SPAM) from your incoming
email. It can be invoked by a MDA such as sendmail or postfix, or can
be called from a procmail script, .forward file, etc. It uses a
genetic-algorithm evolved scoring system to identify messages which
look spammy, then adds headers to the message so they can be filtered
by the user's mail reading software. This distribution includes the
spamd/spamc components which create a server that considerably speeds
processing of mail.