Anti-Spam SMTP Proxy

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Anti-Spam SMTP Proxy
Original author(s) John Hanna
Developer(s) Fritz Borgstedt in association with the ASSP community
Stable release 2.2.1.12137 / May 16, 2012 (2012-05-16)
Written in Perl
Operating system Cross-platform
Type Email spam filter
License GNU General Public License
Website assp.sourceforge.net

The Anti-Spam SMTP Proxy (ASSP) server project is an Open Source, Perl based, platform-independent transparent SMTP proxy server available at SourceForge.net that leverages numerous methodologies and technologies to both rigidly and adaptively identify e-mail spam. ASSP is easy to set up because it requires only minor changes to the configuration of your Mail Transfer Agent.

Features

Some ASSP's features are:

  • Bayesian analysis
  • Penalty Box (PB) trapping
  • DNSBL/RBL (Realtime Blackhole Listing)
  • URIBL (Uniform Resource Identifier Black Listing)
  • Multi-level SPF (Sender Policy Framework) validation and blocking
  • 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)
  • As well as multiple RFC validation mechanisms.
  • Multi-threaded (Since version 2.x)
  • Platform independent (Written in Perl)

Disadvantages

From a technical point of view, the software is written in an obfuscated style which makes it difficult to debug, and update[citation needed]. For example, the entire program is written as a single Perl program file, rather than being broken into modules.

See also

  • Transparent SMTP proxy
  • SpamAssassin, popular open source spam filtering that uses razor and other techniques to detect spam.
  • Qpsmtpd, a similar project

External links

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