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| Design by | John Hanna |
|---|---|
| Developed by | Fritz Borgstedt in association with the ASSP community |
| Latest release | 1.4.3 / Nov 11, 2008 |
| Written in | Perl |
| OS | 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 your Mail Transfer Agent.
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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.
Disadvantages
The software is considered platform independent, because it is programmed in Perl, an interpreted language available for virtually all platforms. But this comes for a cost, as Perl has performance considerably lower than compiled languages. A second issue seems to be that the software is "full featured", something that may imply that is has too many features, and it sometimes may make it difficult for an unskilled administrator to configure it for optimal results. However, this is mitigated by a strong user community, and available online resources. From a technical point of view, the software is written in an obfuscated "perlish" style which makes it difficult to debug, and update. Finally, the biggest performance problems seem to come from the fact that the software is not multithreaded, so the whole software runs in a single loop, which has to take care of all connections and activities. This leads to escalation problems when installed in a heavy load environment. There currently is an effort on making a whole new multithreaded version. Despite these disadvantages, when the email server is not heavily loaded, and the administrator has the skills, the software may provide optimum results.
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
- ASSP official homepage
- ASSP Wiki
- ASSP beta development site
- ASSP X free cPanel/WHM frontend for ASSP
Wikipedia content modification information:
- This page was last modified on 11 November 2008, at 18:12.
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