SpamAssassin is a mature, widely-deployed open source project that serves as a mail filter to identify Spam. SpamAssassin uses a variety of mechanisms including header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. SpamAssassin runs on a server, and filters spam before it reaches your mailbox. It is in use in both email clients and servers, on many different operating systems, filtering incoming as well as outgoing email, and implementing a very broad range of policy actions.

SpamAssassin is a mature, widely-deployed open source project that serves as a mail filter to identify Spam. SpamAssassin uses a variety of mechanisms including header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. SpamAssassin runs on a server, and filters spam before it reaches your mailbox. 

Spamassasin - Intelligent Spam Filter 

ASSP is a SMTP proxy which sits between SMTP server and the MTA. It filers the spam and delivers the legtimate mails to the MTA. Its feature include Bayesian analysis, Sender Policy Framework) validation and blocking, Realtime Blackhole Listing, URL Black Listing, Multi-level attachment blocking, LDAP support, Backscatter Detection, SNMP support and lot more. Sourceforge: <A HREF="http://sourceforge.net/projects/assp/" target="_blank">http://sourceforge.net/projects/assp/</A>

ASSP is a SMTP proxy which sits between SMTP server and the MTA. It filers the spam and delivers the legtimate mails to the MTA. Its feature include Bayesian analysis, Sender Policy Framework) validation and blocking, Realtime Blackhole Listing, URL Black Listing, Multi-level attachment blocking, LDAP support, Backscatter Detection, SNMP support and lot more.

ASSP - Anti-Spam SMTP Proxy

Scrollout F1 is an easy to use, already adjusted email firewall (gateway) offering free anti-spam and anti-virus protection aiming to secure existing email servers, old or new, such as Microsoft Exchange, Lotus Domino, Postfix, Exim, Sendmail, Qmail and others.

Scrollout F1 - An easy-to-use anti-spam email gateway

DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems. DSPAM is an adaptive filter which means it is capable of learning and adapting to each user's email. Instead of working off of a list of rules to identify spam. DSPAM's probabilistic engine examines the content of each message and learns what type of content the user deems as spam or nonspam. 
 Source forge: <A HREF="http://sourceforge.net/projects/dspam/" target="_blank">http://sourceforge.net/projects/dspam/</A>

DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems. DSPAM is an adaptive filter which means it is capable of learning and adapting to each user's email. Instead of working off of a list of rules to identify spam. DSPAM's probabilistic engine examines the content of each message and learns what type of content the user deems as spam or nonspam.

DSpam - Content based Spam Filter

Bogofilter is a mail filter that classifies mail as spam or ham (non-spam) by a statistical analysis of the message's header and content (body). The program is able to learn from the user's classifications and corrections. Bogofilter provides processing for plain text and HTML. It supports multi-part MIME messages with decoding of base64, quoted-printable, and uuencoded text and ignores attachments, such as images.

bogofilter -- Fast Bayesian Spam Filter

SpamTestBuddy is a simple, light-weight, multiple-input spam scoring tool. It is standalone and can be used with simple procmail rules without root access or daemons. It has built-in support for simple DNS checks including DNSBL (DNS-based blocklist) queries, and can scan headers from filters such as SpamProbe, QSF, DSPAM that you already use. It reduces both false positives and false negatives with the benefit of extra spam tests. 

SpamTestBuddy - Spam Scoring Tool

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Spamassasin - Intelligent Spam Filter

ASSP - Anti-Spam SMTP Proxy

Scrollout F1 - An easy-to-use anti-spam email gateway

DSpam - Content based Spam Filter

bogofilter -- Fast Bayesian Spam Filter

SpamTestBuddy - Spam Scoring Tool

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Projects

Spamassasin - Intelligent Spam Filter

ASSP - Anti-Spam SMTP Proxy

Scrollout F1 - An easy-to-use anti-spam email gateway

DSpam - Content based Spam Filter

bogofilter -- Fast Bayesian Spam Filter

SpamTestBuddy - Spam Scoring Tool

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