Best Open Source Anti-Spam Software 2026

Anti-Spam Software

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Browse free open source Anti-Spam software and projects below. Use the toggles on the left to filter open source Anti-Spam software by OS, license, language, programming language, and project status.

MongoDB Atlas runs apps anywhere
Deploy in 115+ regions with the modern database for every enterprise.

MongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.

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SIEM | API Security | Log Management Software
AI-Powered Security and IT Operations Without Compromise.

Built on the Graylog Platform, Graylog Security is the industry’s best-of-breed threat detection, investigation, and response (TDIR) solution. It simplifies analysts’ day-to-day cybersecurity activities with an unmatched workflow and user experience while simultaneously providing short- and long-term budget flexibility in the form of low total cost of ownership (TCO) that CISOs covet. With Graylog Security, security analysts can:

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1

MailCleaner

Anti Spam SMTP Gateway

MailCleaner Open Source Edition is now discontinued but will continue under the spamtagger project https://github.com/SpamTagger [antispam] MailCleaner is an anti-spam / anti-virus filter SMTP gateway with user and admin web interfaces, quarantine, multi-domains, multi-templates, multi-languages. Using Bayes, RBLs, Spamassassin, MailScanner, ClamAV. Based on Debian. Enterprise ready. MailCleaner is an anti spam gateway installed between your mail infrastructure and the Internet. It includes a complete GNU/Linux OS and a graphical web interface for user and administrative access. It comes in the form of virtual machine templates.. - fully compatible with any SMTP mail server (Exchange, Zimbra, O365,...)

6 Reviews

Downloads: 1 This Week

Last Update: 2025-10-27
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2

CIDRAM

CIDRAM: Classless Inter-Domain Routing Access Manager.

CIDRAM (Classless Inter-Domain Routing Access Manager) is a PHP script designed to protect websites by blocking requests originating from IP addresses regarded as being sources of undesirable traffic, including (but not limited to) traffic from non-human access endpoints, cloud services, spambots, scrapers, etc. It does this by calculating the possible CIDRs of the IP addresses supplied from inbound requests and then attempting to match these possible CIDRs against its signature files (these signature files contain lists of CIDRs of IP addresses regarded as being sources of undesirable traffic); If matches are found, the requests are blocked.

Downloads: 0 This Week

Last Update: 2023-08-01
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3

Copfilter

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.

4 Reviews

Downloads: 0 This Week

Last Update: 2015-03-14
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4

MsTasty

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

Downloads: 0 This Week

Last Update: 2013-04-10
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Dominate AI Search Results
Generative Al is shaping brand discovery. AthenaHQ ensures your brand leads the conversation.

AthenaHQ is a cutting-edge platform for Generative Engine Optimization (GEO), designed to help brands optimize their visibility and performance across AI-driven search platforms like ChatGPT, Google AI, and more.

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