Rspamd – fast, free and open-source spam filtering system

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. Each message is analyzed by Rspamd and given a spam score.

According to this spam score and the user’s settings, Rspamd recommends an action for the MTA to apply to the message, for example, to pass, reject or add a header. Rspamd is designed to process hundreds of messages per second simultaneously, and provides a number of useful features.

Rspamd is free and open source software.

Features include:

  • Web interface. Rspamd is shipped with the fully functional Ajax-based web interface that allows to monitor and configure Rspamd rules, scores, dynamic lists, to scan and learn messages and to view the history of scans. The web interface is self-hosted, requires zero configuration and follows the recent web applications standards.
  • Integration with MTA. Rspamd can work with the most popular mail transfer systems, such as Postfix, Exim, Sendmail or Haraka.
  • Extensive Lua API. Rspamd ships with hundreds of Lua functions that are helpful to create your own rules for efficient and targeted spam filtering.
  • Dynamic tables – it is possible to specify bulk lists as dynamic maps that are checked in runtime with updating data only when they are changed. Rspamd supports file, HTTP and HTTPS maps.
  • Supports various types of content scanning checks: Regular expression filtering, fuzzy hashes, DCC, and Chartable.
  • Supports various policy checks: SPF, DKIM, DMARC, ARC, Whitelists, DNS lists, URL lists, Phishing checks, Rate limits, IP reputation, Greylisting, Replies module, and Maps module.
  • Statistical tools: Bayes classifier and Neural network.

Website: rspamd.com
Support: Documentation, FAQ, GitHub Code Repository
Developer: Vsevolod Stakhov
License: Apache License 2.0

Rspamd is written in C and Lua. Learn C with our recommended free books and free tutorials. Learn Lua with our recommended free books and free tutorials.

Return to Anti-Spam Tools Home Page


Popular series
Guide to LinuxNew to Linux? Read our Linux for Starters series. We start right at the basics and teach you everything you need to know to get started with Linux.
Free and Open Source SoftwareThe largest compilation of the best free and open source software in the universe. Each article is supplied with a legendary ratings chart helping you to make informed decisions.
ReviewsHundreds of in-depth reviews offering our unbiased and expert opinion on software. We offer helpful and impartial information.
Alternatives to Proprietary SoftwareReplace proprietary software with open source alternatives: Google, Microsoft, Apple, Adobe, IBM, Autodesk, Oracle, Atlassian, Corel, Cisco, Intuit, and SAS.
Linux Around The WorldLinux Around The World showcases events and usergroups that are relevant to Linux enthusiasts.
AudioSurveys popular streaming services from a Linux perspective: Amazon Music Unlimited, Myuzi, Spotify, Deezer, Tidal.
Saving Money with LinuxSaving Money with Linux looks at how you can reduce your energy bills running Linux.
System ToolsEssential Linux system tools focuses on small, indispensable utilities, useful for system administrators as well as regular users.
ProductivityLinux utilities to maximise your productivity. Small, indispensable tools, useful for anyone running a Linux machine.
Home ComputersHome computers became commonplace in the 1980s. Emulate home computers including the Commodore 64, Amiga, Atari ST, ZX81, Amstrad CPC, and ZX Spectrum.
Now and ThenNow and Then examines how promising open source software fared over the years. It can be a bumpy ride.
Linux at HomeLinux at Home looks at a range of home activities where Linux can play its part, making the most of our time at home, keeping active and engaged.
Linux CandyLinux Candy reveals the lighter side of Linux. Have some fun and escape from the daily drudgery.
DockerGetting Started with Docker helps you master Docker, a set of platform as a service products that delivers software in packages called containers.
Android AppsBest Free Android Apps. We showcase free Android apps that are definitely worth downloading. There's a strict eligibility criteria for inclusion in this series.
Programming BooksThese best free books accelerate your learning of every programming language. Learn a new language today!
Programming TutorialsThese free tutorials offer the perfect tonic to our free programming books series.
Stars and StripesStars and Stripes is an occasional series looking at the impact of Linux in the USA.

Share your Thoughts

This site uses Akismet to reduce spam. Learn how your comment data is processed.