Spam Filter

Off-network filtering (a spam filter that does its work on the user's computer once a user has downloaded his mail) is done by built-in features of the user's mail client, although add-on filter programs are becoming increasingly popular.
Procmail is a popular component of unix-based smtp/pop/imap mail systems, and can be configured for spam filtering.
Bayesian FilterL: A form of content-based spam filter named for Reverend Thomas Bayes' famous theorem of conditional probabilities.
Qurb: An award winning integrated spam filter for Microsoft Outlook and Outlook Express.
Spam filtering services offered by many retail isps, commercial online spam-filtering services (such as spamcop), mda-based procmail scripts, or packages like spamassassin, are all examples of on-network filtering.
A low rate of false positives is an indication of the effectiveness of a spam filter.
RBL (real time blacklist): An online database of email spam sites that may be used for email spam filtering, either on a personal basis or used by an entire site.
Spamassassin is a highly versatile and configurable spam filtering program that identifies spam by testing for certain predefined "fingerprints" and assigning arbitrary numerical scores where it finds them; messages that exceed a user-adjustable threshold score are then tagged as spam.
There are many good and not so good spam filters out there for outlook.

spam filter

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