Open Source Mac Anti-Spam Software

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 are also available for download. NOTICE: V1 development has been stopped at the end of 2014 (1.10.1 build 16060). Possibly there will be done some bugfixing in future. Please upgrade to V2, which is and will be actively maintained.

MsTasty is a free, PHP-based and modular IRC bot

Copfilter is a easy to install addon for the opensource firewall IPCop. It filters POP3, SMTP, HTTP, and FTP traffic for viruses and spam using various open source programs.

FilterBadRecruiters is a Google Apps Script that processes new messages looking for unwanted email from known third party recruiters. When a match is found, a reply is sent informing the sender that the message is being reported as spam and will not be read. The script then logs matches to a spreadsheet and updates a pie chart displaying what percentage of these type of messages were sent from each domain.

An open, all-in-one SMTP gateway, scanning your email traffic in order to prevent spam and viruses, using several anti-spam technologies. Based on Ubuntu Server.

Spamtools is a java package designed to propose a unified and expendable library for the implementation of experimental spam filters.

This tool provides the same interface as a SiteErrorLog but provides the ability to specify who should receive error emails, what error emails are sent, and extra information to put in the headers of the error emails to provide easier mail filtering.