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) == See also ==