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bmf is an extremely efficient Bayesian mail filter based on Paul Graham's article, "A Plan for Spam." It's fast, small, efficient, and more versatile than other Bayesian filters.

Jive is a filter that converts English text to Jive. Jive reads from standard input and writes to standard output.

Valspeak is a filter that converts English text to valspeak. Valspeak reads from standard input and writes to standard output.

qconfirm is an implementation of a delivery confirmation process for a mail address under qmail. It is invoked by qmail-local through a .qmail file. qconfirm performs this delivery confirmation process either sender based or message based. It is similar in concept to qsecretary or TMDA.

GNU Ocrad is an OCR (Optical Character Recognition) program implemented as a filter and based on a feature extraction method. It reads a bitmap image in pbm format and outputs text in ISO-8859-1 (Latin-1) charset. Also includes a layout analyser able to separate the columns or blocks of text normally found on printed pages. It can be used as a stand-alone console application, or as a backend to other programs.

spamdyke is a filter for monitoring and intercepting SMTP connections between a remote host and a qmail server. Spam is blocked while the remote server (spammer) is still connected; no additional processing or storage is needed. In addition to all of its anti-spam filters, spamdyke also includes a number of features to enhance qmail. Best of all, using spamdyke does not require patching or recompiling qmail!

ClamSMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software. It accepts SMTP connections and forwards the SMTP commands and responses to another SMTP server. The 'DATA' email body is intercepted and scanned before forwarding. ClamSMTP aims to be lightweight, reliable, and simple rather than have a myriad of options. It's written in C without major dependencies. If you need more options then you could use something big like AMaViS which is written in PERL and can do almost anything.

Sievelog is a message dispatcher inspired by swatch but more focused on the following problems: * Having a clean syntax * Directing a raw syslog stream to different files based on content * Mailing out alerts based on content * Being fast Sievelog's syntax is as simple as "<regex>" -> /some/file.

This is an implementation of DomainKeys draft standard for the Postfix mail transfer agent. DomainKeys is proposed by Yahoo!, Inc. and this is a scheme to sign and verify e-mail messages on a per-domain basis. Protocol and other issues about this draft standard can be found at http://antispam.yahoo.com/domainkeys.

This is an implementation of DomainKeys Identified Mail (DKIM) draft standard for the Postfix mail transfer agent. DKIM is a scheme to sign and verify e-mail messages on a per-domain basis. Details regarding the protocol and other issues related to the draft standard can be found at http://mipassoc.org/dkim/.