Your search for "spam" returned 9 results:
Bayesian (or Other Statistical) Filtering
Add a new statistical filter test to ORF. The most widely known and used statistical technique is Bayesian filtering, a "learning" email classification method. When properly trained and maintained, statistical filters work very effectively.
However, they require a reliable feed of actual legitimate and spam messages for initial training, so end-users are likely required to participate in the training.
12 comments
2
Daily Digest Reports To The End-User
Send daily digest reports the end-user about the emails blacklisted for them. When combined with the "Quarantine (Web-based)" request, this would also allow direct releasing of quarantined emails.
6
DONE Honeypot (Spamtrap)
Blacklist the sender IP address of those writing to specific local email addresses, e.g. addresses published on
the company web site specifically as honeypot (spamtrap) addresses. This feature would be based on the assumption
that whoever sends email to the honeypot address(es) must be a wrongdoer, because the honeypot address may be
collected only by robots scanning the internet (and the web, specifically) for email addresses, which is a typical
spammer behavior.
DONE Directory Harvest Attack (DHA) Protection
Add a new test to ORF that would temporarily reject all delivery attempts if the sending IP address is sending to more than "X" (user-configurable) non-existent recipients within in a specified period of time. This would provide some protection against poorly distributed or non-distributed Directory Harvest Attacks.