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Vipul's Razor is a distributed, collaborative, spam detection and filtering network. Razor establishes a distributed and constantly updating catalogue of spam in propagation. This catalogue is used by clients to filter out known spam. On receiving a spam, a Razor Reporting Agent (run by an end-user or a troll box) calculates and submits a 20-character unique identification of the spam (a SHA Digest) to its closest Razor Catalogue Server. The Catalogue Server echos this signature to other trusted servers after storing it in its database. Prior to manual processing or transport-level reception, Razor Filtering Agents (end-users and MTAs) check their incoming mail against a Catalogue Server and filter out or deny transport in case of a signature match. Catalogued spam, once identified and reported by a Reporting Agent, can be blocked out by the rest of the Filtering Agents on the network.

bsfilter is a spam filter using Bayesian(statistical) algorithm. - a filter which distinguishes spam and non-spam mail - support mails written in English and Japanese language - written in Ruby - support 3 methods for access -- traditional Unix-style filter. study and judge local files or pipe -- IMAP. study and judge mails in an IMAP server. IMAP over SSL supported -- POP proxy. run between POP server and MUA. POP over SSL supported - distributed under GPL

FuzzyOcr is a plugin for SpamAssassin which scans image attachments for spam keywords, using an Optical Character Recognition program. This plugin can be used to detect spam that puts all the real spam content in an attached image. The mail itself only random text and random html, without any URLs or identifiable information. It is also able to do approximate matches on words, so errors in recognition or attempts to obfuscate the text inside the image will not cause the detection to fail.

SpamAssassin is a mail filter which attempts to identify spam using text analysis and several internet-based realtime blacklists. Using its rule base, it uses a wide range of heuristic tests on mail headers and body text to identify "spam", also known as unsolicited commercial email. Once identified, the mail can then be optionally tagged as spam for later filtering using the user's own mail user-agent application. Additional drop-in rule sets are available at http://wiki.apache.org/spamassassin/CustomRulesets

Junk Mail Buffering Agent is a tool for preventing delivery of email until the sender has confirmed their address. It can be used in conjunction with a spam filter to prevent delivery of spammy-looking email unless the sender is confirmed as valid. jmba is designed to be used in conjunction with a spam filter such as QSF and the mail processor procmail. When the spam filter says it thinks an email is spam, it can be passed to jmba. jmba will queue it and send an email to the sender containing a key; if the sender replies, the original email is "unfrozen" from the queue and delivered.

milter manager protects you from spam mails and virus mails effectively with milter. milter manager has embedded Ruby interpreter to control milters flexibly.

Tumgreyspf, an external policy checker for the postfix mail server. It can optionally greylist and/or use spfquery to check SPF records to determine if email should be accepted by your server. Because of its design, legitimate e-mail is never trapped or rejected. Only spam and viruses are caught. Since adding it to our mail server (which also uses Spam Assassin, ClamAV, and an outsourced anti-spam system), our spam level has dropped by an order of magnitude. It uses the file-system as its database, no additional database is required to use it.

Spamcalc takes a hostname or a list of hostnames and determines a dns spam score for each hostname. This value is an indication for the spam-ness of the hostname. The higher the score, the higher the chance that the hostname is actually a dns spam hostname. Hostnames that are considered dns spam are hostnames with (a part of) a sentence in them (master.of.the.world.net), swearwords (shittywhore.armaster.roadkill.net) and other forms of unwanted textual data (666666666666666666666666666666666.sixtysix.org, 0-1-2-3-4-5.blah.com).

This plugin enables the scanning of incoming mail received from a POP, IMAP, or LOCAL account using Bogofilter. It can optionally delete mail identified as spam or save it to a designated folder. Bogofilter is a pure Bayesian filter, therefore it has better speed performance than SpamAssassin but might catch less spam.

relaydb is a mail header analyzer that builds a database of IP addresses either known as legitimate senders or spammers. relaydb doesn't itself classify mails as legitimate or spam, that decision needs to be reached through other means. Neither does relaydb block spam itself. It merely provides a list of IP addresses to block through other means.