The Anti-Spam SMTP Proxy (ASSP) is an
open-source
Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use and view the source code, design documents, or content of the product. The open source model is a decentrali ...
,
Perl
Perl is a high-level, general-purpose, interpreted, dynamic programming language. Though Perl is not officially an acronym, there are various backronyms in use, including "Practical Extraction and Reporting Language".
Perl was developed ...
based, platform-independent
transparent SMTP proxy
SMTP proxies are specialized mail servers that, similar to other types of proxy servers, pass simple mail transfer protocol (SMTP) sessions through to other SMTP servers without using the store-and-forward approach of a mail transfer agent (MTA). ...
server.
Features
Some ASSP's features are:
*
Hidden Markov Model spam filtering
*
Bayesian spam filtering
In statistics, naive (sometimes simple or idiot's) Bayes classifiers are a family of " probabilistic classifiers" which assumes that the features are conditionally independent, given the target class. In other words, a naive Bayes model assumes th ...
* whitelisting
* Penalty Box (PB) trapping
*
DNSBL
A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query w ...
/RBL (Realtime Blackhole Listing)
* URIBL (
Uniform Resource Identifier
A Uniform Resource Identifier (URI), formerly Universal Resource Identifier, is a unique sequence of characters that identifies an abstract or physical resource, such as resources on a webpage, mail address, phone number, books, real-world obje ...
Black Listing)
* Multi-level
SPF (Sender Policy Framework) validation and blocking
* DKIM signing and validation
* DMARC validation and reporting
*
SRS
SRS or SrS may stand for:
Organizations and companies
Companies
*Sperry Rail Service, a rail inspection contractor
*Stanford Research Systems, a test and measurement instruments manufacturer
* SRS Cinemas, in India
* SRS Labs, an American aud ...
(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
In computer architecture, multithreading is the ability of a central processing unit (CPU) (or a single core in a multi-core processor) to provide multiple threads of execution.
Overview
The multithreading paradigm has become more popular a ...
(Since version 2.x)
* Platform independent (Written in
Perl
Perl is a high-level, general-purpose, interpreted, dynamic programming language. Though Perl is not officially an acronym, there are various backronyms in use, including "Practical Extraction and Reporting Language".
Perl was developed ...
)
See also
*
Transparent SMTP proxy
SMTP proxies are specialized mail servers that, similar to other types of proxy servers, pass simple mail transfer protocol (SMTP) sessions through to other SMTP servers without using the store-and-forward approach of a mail transfer agent (MTA). ...
*
SpamAssassin
Apache SpamAssassin is a computer program used for e-mail spam filtering. It uses a variety of spam-detection techniques, including DNS and fuzzy checksum techniques, Bayesian filtering, external programs, blacklists and online databases. It ...
, popular open source spam filtering that uses razor and other techniques to detect spam.
*
Qpsmtpd
qpsmtpd is an SMTP daemon written in Perl. It was originally designed to be a drop-in replacement for ''qmail-smtpd'', the SMTP component of qmail, and it is now also compatible with Postfix, Exim, sendmail and virtually any software that "speak ...
, a similar project
External links
ASSP official homepageASSP sourceforge project pageForumASSP WikiASSP beta development siteASSP Deluxe for cPanel/WHM frontend for ASSP
{{Perl
Anti-spam
Perl software
Free email software