SSL/TLS and IPv6 support Positive rejection notification: no blowback/backscatter or mail loss Bayesian analysis Greylisting, Whitelisting, Blacklisting and Redlisting Envelop validation Backscatter detection IP Reputation tracking Penalty Box (PB) trapping Realtime Blackhole Listing DNSBL/RBL URIBL (Uniform Resource Identifier Black Listing) SenderBase Reputation Network validation, blacklisting and whitelisting Country blocking Multi-level SPF (Sender Policy Framework) validation and blocking SRS (Sender Rewriting Scheme) for SPF Session Delaying/Greylisting and connection response delaying Sender validation and recipient validation (LDAP) Multi-level attachment blocking (based on block lists or allow lists) Virus/Phish/Malware detection. Regex based header and content filtering. As well as multiple RFC validation mechanisms. Comprehensive Scoring and Logging Accepts whitelist submissions and spam error reports by authorized users.
What features make ASSP great?
Easy browser-based setup. Uses your existing message transport and existing SMTP server. Works with Sendmail, qmail, Postfix, Imail, Exchange, Courier, Mercury, Lotus Notes, EIMS and all other standard SMTP servers. Automatically customizes to your site’s unique email profile. Automatic whitelist – noone you email will ever be blocked. Senders receive immediate notification if mail is blocked and no erroneous bounces are ever generated. Redlist keeps an address off the whitelist. No-processing addresses pass through. Makes use of honeypot type spambucket addresses to automatically recognize spam and update your spam database. Bayesian filter intelligently classifies email into spam and non-spam. Supports additional site-defined regular expressions to identify spam or non-spam email. Can optionally block all non-whitelisted email (for anti-spam zelots). Mime encoded and other camouflaged spam is also recognized. Automatically maintains the spam and non-spam databases. Accepts whitelist submissions and spam error reports by authorized users. Optionally rejects executable attachments from non-whitelisted (or all) addresses. Practically no maintenance required. Optionally blocks no mail but adds an email header and/or updates the message subject. Optionally uses community-based spam statistics to identify hosts that are likely to send spam or non-spam mail. Individual users can be configured to receive all mail. Shows detailed analysis of spam rating process for specific messages. Option to forward a copy of every rejected mail to an address. Blocks spam-bombs/joejobs (when spammers forge your domain in the from field). Keeps spam statistics for your site. And much more!