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High-performance interface between the MTA and content checkers.

amavisd-new-templates

Templates for amavisd-new

anomy-sanitizer

Perl based e-mail filtering tool, sensitive to html tags, mime types and attachments

GNU Anubis is an outgoing mail processor.

Active Spam Killer: A program to filter spam

Anti-Spam SMTP Proxy written in Perl.

A fast and small Bayesian spam filter

Bayesian spam filter designed with fast algorithms, and tuned for speed.

bayesian spam filter which distinguishes spam and non-spam mail

clamassassin is a simple script for virus scanning (through clamav) an e-mail message as a filter (like spamassassin)

ClamSMTP is an SMTP filter that allows you to check for viruses using the ClamAV anti-virus software.

courier-pythonfilter

SRS (Sender Rewriting Scheme) wrapper for the courier MTA.

Distributed Checksum Clearinghouse

A Perl script that removes spam from POP3 mailboxes based on RBLs.

A milter-based application provide DomainKeys service

A milter-based application to provide DomainKeys Identified Mail (DKIM) service

An SMTP proxy that signs and/or verifies emails using the Mail::DKIM module

dovecot-antispam

A dovecot antispam plugin supporting multiple backends

dovecot-metadata

dovecot_deleted_to_trash

A statistical-algorithmic hybrid anti-spam filter

A standalone anti-spam greylisting algorithm on top of Postfix

gross - Greylisting of suspicious sources

An IMAP mail filtering utility

IMAP Spam Begone: a script that makes it easy to scan an IMAP inbox for spam using SpamAssassin

a library to verify and create signatures of e-mail headers

a library for exim to verify and create signatures of e-mail headers

libdomainkeys is a library usable by MTAs to verify and create signatures of e-mail headers.

The Sendmail Filter API (Milter)

A library for parsing, sorting and filtering your mail.

libspf2 implements the Sender Policy Framework, a part of the SPF/SRS protocol pair.

libsrs2 is the next generation Sender Rewriting Scheme library

Sender Rewriting Scheme library

Mail delivery agent/filter

Mailfilter is a utility to get rid of unwanted spam mails

Free Anti-Virus and Anti-Spam Filter

A challenge/response-based white-list spam filter

milter-greylist

Milter-greylist is a stand-alone milter that implements the greylist filtering method

A milter-based regular expression filter

A program for Milter supported mail servers that implements antispam, antivirus, and other customizable filtering on email messages

Helper program to normalize MIME encoded messages

A milter-based application to provide DKIM signing and verification

This is a full-transparent proxy-server for POP3-Clients.

Policy daemon for postfix and other MTAs

Weighted Policy daemon for Postfix

Anti-spam bayesian filter

Postgrey is a Postfix policy server implementing greylisting

Per-recipient whitelist policy server for Postfix MTA managed entirely by emails.

Mail delivery agent/filter

Procmail Module Library is a collection of modules for Procmail

An SMTP proxy similar to ClamSMTP but that works with any user-defined filter.

Python based policy daemon for Postfix SPF checking

E-Mail virus scanner for qmail.

Vipul's Razor is a distributed, collaborative spam detection and filtering network

Perform lookups in RBL-styles services.

An SMTP proxy for solicited bounce detection

a mail filter written in Scheme

A milter-based application to provide Sender-ID verification service

Sieve Command Line Interface

Sendmail ClamAV milter

smf common atom

Sendmail GreyList milter

Sendmail GreyList milter, extended version

Sendmail Sender Address Validator

Sendmail SpamAssassin milter

Sendmail SPF milter

Sendmail Zombie SPAM Blocker

A milter for SpamAssassin

SpamAssassin is an extensible email filter which is used to identify spam.

spamassassin-botnet

SpamAssassin plugin that attempts to detect messages sent by a botnet

spamassassin-fuzzyocr

SpamAssassin plugin for performing Optical Character Recognition (OCR) on attached images

An anti-spam filter using on Bayesian filtering

A drop-in connection-time spam filter for qmail

spampd is a program used within an e-mail delivery system to scan messages for possible Unsolicited Commercial E-mail content.

Fast, intelligent, automatic spam detector using Bayesian analysis.

spmfilter - mail filtering framework

spmfilter-diskarchive

spmfilter-smtpbcc

Sends a copy of each incoming and outgoing message to a defined smtp host

SQLgrey is a postfix policy service implementing a grey-listing policy

Python-based SPAM reduction system