Anti-Spam SMTP Proxy
The Anti-Spam SMTP Proxy 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 trapping
- DNSBL/RBL
- URIBL
- Multi-level SPF validation and blocking
- DKIM signing and validation
- DMARC validation and reporting
- SRS fix-up
- Session Delaying/Greylisting and connection response delaying
- Sender validation and recipient validation
- Multi-level attachment blocking
- As well as multiple RFC validation mechanisms.
- Multi-threaded
- Platform independent