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Anti Spam SMTP Proxy

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Original author(s)
  
John Hanna

Operating system
  
Cross-platform

Written in
  
Perl

Developer(s)
  
Thomas Eckardt in association with the ASSP community

Stable release
  
2.5.5(16366) / December 31, 2016; 30 days ago (2016-12-31)

Preview release
  
2.5.6(17022) / January 22, 2017; 8 days ago (2017-01-22)

The Anti-Spam SMTP Proxy (ASSP) is an Open Source, Perl based, platform-independent transparent SMTP proxy server.

Features

Some ASSP's features are:

  • Hidden Markov Model spam filtering
  • Bayesian spam filtering
  • whitelisting
  • Penalty Box (PB) trapping
  • DNSBL/RBL (Realtime Blackhole Listing)
  • URIBL (Uniform Resource Identifier Black Listing)
  • Multi-level SPF (Sender Policy Framework) validation and blocking
  • DKIM signing and validation
  • DMARC validation and reporting
  • SRS (Sender Rewriting Scheme) fix-up
  • Session Delaying/Greylisting and connection response delaying
  • Sender validation and recipient validation
  • Multi-level attachment blocking (based on block lists or allow lists or content based executable blocking)
  • As well as multiple RFC validation mechanisms.
  • Multi-threaded (Since version 2.x)
  • Platform independent (Written in Perl)

    • References

    Anti-Spam SMTP Proxy Wikipedia
    (Text) CC BY-SA