Spamassasin - Intelligent Spam Filter

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SpamAssassin is a mature, widely-deployed open source project that serves as a mail filter to identify Spam. SpamAssassin uses a variety of mechanisms including header and text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases. SpamAssassin runs on a server, and filters spam before it reaches your mailbox.

spam email-spam-filtering spam-filtering content-filtering

DSpam - Content based Spam Filter

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DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems. DSPAM is an adaptive filter which means it is capable of learning and adapting to each user's email. Instead of working off of a list of rules to identify spam. DSPAM's probabilistic engine examines the content of each message and learns what type of content the user deems as spam or nonspam.

spam email-spam-filtering spam-filtering content-filtering

Rspamd - Fast, free and open-source spam filtering system

•    C

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Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules including regular expressions, statistical analysis and custom services such as URL black lists. It supports Regular expressions filtering, SPF, DKIM, DNS black list, URL black lists, Fuzzy hashes etc.

spam-filtering spam-analysis email-spam-filtering spf dkim

Scrollout F1 - An easy-to-use anti-spam email gateway

•    C++

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Scrollout F1 is an easy to use, already adjusted email firewall (gateway) offering free anti-spam and anti-virus protection aiming to secure existing email servers, old or new, such as Microsoft Exchange, Lotus Domino, Postfix, Exim, Sendmail, Qmail and others.

anti-spam email-spam-filtering spam-filtering spam anti-viris

Spam Assistant Tokugawa

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This project aims to provide an extension for Apple's Mail program to support an email address verification based spam filtering. The filtering is based on the simple idea that spammers usually do not send spam from existing addresses. The extension will

Spay - SPam BAYesian Filter Project

•    C

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This project applies statistical text categorization techniques to the domain of spam mail filtering. The goal is to produce mail filtering software that can be trained to recognize spam in a particular individual's email. The statistical models produc

SMTP Guard Filter

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Spam filter for SMTP server. Check emails for spam against 9 different filters. Easy to customize and tune to your specific needs. Easy to create new filters. Eliminate 99% of spam.

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Spam Trainer

•    CSharp

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Not all email clients have Spam filtering (and training) built in. Spam Trainer provides easy (drag and drop) training from your mail client, passing messages through to your spam filter (e.g. Spambayes) via command line scripts.

nginx-ultimate-bad-bot-blocker - Nginx Block Bad Bots, Spam Referrer Blocker, Vulnerability Scanners, User-Agents, Malware, Adware, Ransomware, Malicious Sites, with anti-DDOS, Wordpress Theme Detector Blocking and Fail2Ban Jail for Repeat Offenders

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Please make sure you are subscribed to Github Notifications to be notified when the blocker is updated or when any important or mission critical (potentially breaking) changes may take place. This is our new preferred method of installation which is now done through a set of shell scripts contributed to this repo and maintained by Stuart Cardall @itoffshore who is one of the Alpine Linux package maintainers.

nginx nginx-server bot-blocker bots spam-blocker spambot-security spam-protection spam-filtering spam-prevention spam-referers porn-filter gambling-filter scanners vulnerability-scanners referer-blocker referrer-spam spyware adware malware spam-referrer-blocker

phPOP3clean

•    PHP

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PHP-based spam amp; virus/worm filtering for POP3 email accounts. Designed to run as a cron job and catch spam based on links to blacklisted IPs, obfuscated words or blacklisted phrases; attached-image spam; email worms; corrupted or malformed emails.

referrer-spam-blocker - Apache, Nginx, IIS, uWSGI, Caddy & Varnish blacklist + Google Analytics segments to prevent referrer spam traffic 👾

•    VCL

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.htaccess is a configuration file for use on web servers running Apache. This file is usually found in the root “public_html” folder of your website. The .htaccess file uses two modules to prevent referral spam, mod_rewrite and mod_setenvif. Decide which method is most suitable with your Apache server configuration. This file is Apache 2.4 ready, where mod_authz_host got deprecated. The web.config file is located in the root directory of your Windows Server web application.

referrer-spam google-analytics spam-filtering referrer-spam-blocker spam-prevention

Endian Firewall Community

•    Groovy

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Endian Firewall Community (EFW) is a "turn-key" linux security distribution that makes your system a full featured security appliance with Unified Threat Management (UTM) functionalities. The software has been designed for the best usability: very easy to install, use and manage and still greatly flexible. The feature suite includes stateful packet inspection firewall, application-level proxies for various protocols (HTTP, FTP, POP3, SMTP) with antivirus support, virus and spam-filtering f

QSpamDog spam filter

•    PHP

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QSpamDog is a PHP-based email filter which is intended to be used primarily in filtering spam email. It was designed for usage with QMail based email-servers which use the Maildir format for storing users' emails.

SpamProbe - fast bayesian spam filter

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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

Deep Six

•    Perl

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Deep Six is a client side spam filtering tool that monitors your inbox for new email and filters it. The modular filter plugin-system allows for greater spam detection. Currently supports SpamBouncer, Vipul's Razor and DCC.

Vipul's Razor

•    Perl

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Vipul's Razor is a distributed, collaborative, spam detection and filtering network. The primary focus of the system is to identify and disable an email spam before its injection and processing is complete.

NAGS PERL Spam Filter

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The NAGS Spam Filter is a PERL script which can be used to assist in the filtering of incoming email.

Bumper Spam Filter

•    Perl

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quot;Content-neutralquot; spam filtering system

SPAMGrinder

•    VB

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SPAM filtering software that works with POP3 clients to identify, delete, and block SPAM e-mails. Utilizes external SPAM lists as well as customizable local filters.

BSpam

•    Perl

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BSpam is a perl implementation of Paul Graham's Bayesian Spam filtering system: A Plan For Spam.