spamassassin - 3.4.6-1 main

SpamAssassin is a very powerful and fully configurable spam filter
with numerous features including automatic white-listing, RBL
testing, Bayesian analysis, header and body text analysis. It is
designed to be called from a user's .procmail or .forward file, but
can also be integrated into a Mail Transport Agent (MTA).
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Included in this package is a daemonized form of spamassassin (spamd)
which communicates with its client (spamc) via TCP, to reduce the
overhead of loading perl with each message. To take advantage of
this, you must install the spamc package.