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Fast Bayesian spamfilter along lines suggested by Paul Graham
The bogofilter package implements a fast Bayesian spamfilter as
suggested by Paul Graham in "A Plan For Spam"
<http://www.paulgraham.com/spam.html>. It is written in C. Supported platforms: Linux, FreeBSD, Solaris, OS X, HP-UX, AIX, RISC-OS, ...
Anti-Spam SMTP Proxy Server implements multiple spam filters
The Anti-Spam SMTP Proxy (ASSP) Server project aims to create an open source platform-independent SMTP Proxy server which implements auto-whitelists, self learning Hidden-Markov-Model and/or Bayesian, Greylisting, DNSBL, DNSWL, URIBL, SPF, SRS, Backscatter, Virus scanning, attachment blocking, Senderbase and multiple other filter methods. Click 'Files' to download the professional version 2.8.1 build 24261.
A linux(ubuntu 20.04 LTS) and a freeBSD 12.2 based ready to run OVA of ASSP V2...
Tools for a mail delivery service, including LMTP and POP3 servers and also getpwnam() emulation. Mail is stored in Maildir++ format (qmail plus courier extensions as soft quota and subfolders). User defined filter and virtual domains are supported.
This version is no longer maintained here, please see www.firetrust.com for the latest versions
MailWasher Server is a highly accurate server-side spam filtering package with a polished, well-integrated web interface and built-in quarantine management facilities. Fully supports Windows Server/Exchange Server, Linux and Solaris.
dk-milter consists of two parts: A milter-based application (dk-filter) which plugs in to Sendmail to provide DomainKeys service, and a library (libdk) which can be used to build DomainKeys-compliant applications or MTAs. See the home page for details.
This package contains an Open Source plug-in, for use with Open Source or commercial sendmail MTAs, which implements and enforces the merged Caller-ID/SPF specification from the IETF MARID working group, currently dubbed "Sender-ID".
Fast, intelligent, automatic spam detector using Paul Graham style Bayesian analysis of word counts in spam and non-spam emails. Filtering adapts to personal tastes automatically. No manual rule creation required. Intended for use with procmail, maild
g-milter, or "guerilla milter", is an open source filter for restricting arriving mail not checked by existing filters due to standards compliance. Running this will catch more spam but almost certainly violates e-mail standards. Requires sendmail.
An advanced qmail distribution based on qmail-sql which has SMTP, SMTPS, POP3, POP3S, IMAP, IMAPS services, a content scanner, spoofing protections, SMTP AUTH support, SMTP-after-POP/IMAP, PHP5 API, SPF support and much more...
SPASTIC (Simple Procmail Anti-Spam Templates Improved Code) allows filtering of e-mail using simple keywords. The scripts, by default, have different filters for the headers and the body of messages. It also includes a whitelist.
SPAMGrinderProxy is an SMTP and POP3 spamfilter that runs as a service on Windows XP/2K. It works with any server or client, scanning each message for SPAM and flagging those that are. It can interoperate with SpamAssassin or use its own filters.
Philter is a mail filter written in Python to sort mail in a Qmail style Maildir on Linux. It is used in association with a mail fetching tool like getmail. A properties file is used to setup the basic configuration.
Simple BSmtp (Batch-Smtp) file processor with built-in MajorDomo, which can be used stand alone or as filter inside of an Smtp server (here e.g. in Weasel).