Spam Scanner - Best anti-spam, email filtering, and phishing prevention service

•    Javascript

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Spam Scanner is a drop-in replacement and the best alternative to SpamAssassin, rspamd, SpamTitan, and more. Spam Scanner includes modern, essential, and performant features that to help reduce spam, phishing, and executable attacks.

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ASSP - Anti-Spam SMTP Proxy

•    Perl

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ASSP is a SMTP proxy which sits between SMTP server and the MTA. It filers the spam and delivers the legtimate mails to the MTA. Its feature include Bayesian analysis, Sender Policy Framework) validation and blocking, Realtime Blackhole Listing, URL Black Listing, Multi-level attachment blocking, LDAP support, Backscatter Detection, SNMP support and lot more.

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

Spamassasin - Intelligent Spam Filter

•    C

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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

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

•    Shell

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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.

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DSpam - Content based Spam Filter

•    C

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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.

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jASEN - java Anti Spam ENgine

•    Java

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jASEN is a pure java Anti Spam ENgine combining bayesian-like scanning with intelligent email inspection and classification. jASEN is best suited to developers wishing to integrate anti-spam services into an existing server based java email application.

openprotect email filter

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OpenProtect is an anti spam server providing spam filter and virus blocker as an email smtp gateway. Please head to http://www.openprotect.com for more information. You can get a free download at http://www.openprotect.com/anti-spam-download

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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Orchard Anti Spam Module

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The Orchard Anti Spam Module can be used to prevent users from entering messages categorized as spam in forms. It uses online spam services like Akismet and TypePad. It also contains a ReCaptcha part and a Submission Limit part.

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

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.

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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.

laravel-honeypot - Preventing spam submitted through forms

•    PHP

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When adding a form to a public site, there's a risk that spam bots will try to submit it with fake values. Luckily, the majority of these bots are pretty dumb. You can thwart most of them by adding an invisible field to your form that should never contain a value when submitted. Such a field is called a honeypot. These spam bots will just fill all fields, including the honeypot. When a submission comes in with a filled honeypot field, this package will discard that request. On top of that this package also checks how long it took to submit the form. This is done using a timestamp in another invisible field. If the form was submitted in a ridiculously short time, the anti spam will also be triggered.

spam laravel form

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.

The Spam Secretary

•    Python

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The Spam Secretary is an anti-spam email filter based on the article at http://www.paulgraham.com/spam.html. It is written in python and is easy to install. It is mailclient independent, and the hope is that it will be MDA independent as well.

Hermes Secure Email Gateway

•    C

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Hermes Secure Email Gateway is a Free Open Source Email Gateway that provides Spam, Virus and Malware protection, full in-transit and at-rest email encryption as well as email archiving.

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Mailin - Artisanal Inbound Emails for Every Web App

•    Python

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Mailin is an smtp server that listens for emails, parses them and posts them as json to the url of your choice. It checks the incoming emails dkim, spf, spam score (using spamassassin) and tells you in which language the email is written. Mailin can be used as a standalone application directly from the command line, or embedded inside a node application.

smtp-server email-to-json json email mail anti-spam

HeXHub

•    Assembly

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HeXHub is an IOCP-based file-sharing hub and web server with anti-flood protection, built-in firewall designed to filter DDoS, and to prevent most common forms of DoS currently used against hubs, anti-spam protection, content filtering and more.