afew

Initial tagging script for Notmuch

amavisd-milter

sendmail milter for amavisd-new

amavisd-new

High-performance interface between the MTA and content checkers

anubis

GNU Anubis is an outgoing mail processor

ask

Active Spam Killer: A program to filter spam

bmf

A fast and small Bayesian spam filter

bogofilter

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

clamassassin

Simple spamassassin-like script for virus scanning and filtering e-mail messages

clamsmtp

An SMTP filter to check for viruses using the ClamAV anti-virus software

couriersrs

SRS (Sender Rewriting Scheme) wrapper for the courier MTA

dcc

Distributed Checksum Clearinghouse

disspam

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

dkimproxy

An SMTP proxy server for adding DKIM headers

dovecot_deleted_to_trash

Deleted to trash IMAP plugin for Dovecot

dspam

A statistical-algorithmic hybrid anti-spam filter

exim-geoip

This is an IPv4 and IPv6 capable GeoIP dlfunc library for Exim

exim-p0f

This is p0f version 3 dlfunc library for Exim

gld

A standalone anti-spam greylisting algorithm on top of Postfix

imapfilter

An IMAP mail filtering utility

libmilter

The Sendmail Filter API (Milter)

libsieve

A library for parsing, sorting and filtering your mail

libspf2

libspf2 implements the Sender Policy Framework, a part of the SPF/SRS protocols

libsrs2

libsrs2 is the next generation Sender Rewriting Scheme library

libsrs_alt

Sender Rewriting Scheme library

maildrop

Mail delivery agent/filter

mailfilter

Mailfilter is a utility to get rid of unwanted spam mails

MailScanner

Free Anti-Virus and Anti-Spam Filter

mapson

A challenge/response-based white-list spam filter

milter-regex

A milter-based regular expression filter

mimedefang

Antispam, antivirus and other customizable filters for MTAs with Milter support

normalizemime

Helper program to normalize MIME encoded messages

opendkim

A milter providing DKIM signing and verification

opendmarc

Open source DMARC implementation

opensmtpd-extras

Extra tables, filters, and various other addons for OpenSMTPD

policyd

Policy daemon for postfix and other MTAs

policyd-weight

Weighted Policy daemon for Postfix

popfile

Anti-spam bayesian filter

postforward

Postfix Sender Rewriting Scheme forwarding agent

postfwd

Versatile Postfix policy server with a flexible ruleset based configuration

postgrey

Postgrey is a Postfix policy server implementing greylisting

postsrsd

Postfix Sender Rewriting Scheme daemon

procmail

Mail delivery agent/filter

procmail-lib

Procmail Module Library is a collection of modules for Procmail

pypolicyd-spf

Python-based policy daemon for Postfix SPF verification

razor

Distributed, collaborative spam detection and filtering network

rblcheck

Perform lookups in RBL-styles services

rmilter

Another sendmail milter for different mail checks

rspamd

Rapid spam filtering system

scmail

a mail filter written in Scheme

sid-milter

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

sieve-connect

Sieve Command Line Interface

sigh

S/MIME signing milter

spamassassin

An extensible mail filter which can identify and tag spam

spamassassin-botnet

SpamAssassin plugin that attempts to detect messages sent by a botnet

spambayes

An anti-spam filter using on Bayesian filtering

spamdyke

A drop-in connection-time spam filter for qmail

spampd

spampd is a program to scan messages for Unsolicited Commercial E-mail content

spamprobe

Fast, intelligent, automatic spam detector using Bayesian analysis

sqlgrey

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

tmda

Python-based SPAM reduction system

afew

libsieve

postsrsd

amavisd-milter

libspf2

procmail

amavisd-new

libsrs2

procmail-lib

anubis

libsrs_alt

pypolicyd-spf

ask

maildrop

razor

bmf

mailfilter

rblcheck

bogofilter

MailScanner

rmilter

clamassassin

mapson

rspamd

clamsmtp

milter-regex

scmail

couriersrs

mimedefang

sid-milter

dcc

normalizemime

sieve-connect

disspam

opendkim

sigh

dkimproxy

opendmarc

spamassassin

dovecot_deleted_to_trash

opensmtpd-extras

spamassassin-botnet

dspam

policyd

spambayes

exim-geoip

policyd-weight

spamdyke

exim-p0f

popfile

spampd

gld

postforward

spamprobe

imapfilter

postfwd

sqlgrey

libmilter

postgrey

tmda