NoSpam: An IP-agnostic blog spam filtering solution
NoSpam is a service for real-time detection of blog comment spam.
It works without relying on the reputation of the submitter's IP
address, which is a common limitation in the more popular spam
filtering services that doesn't allow for anonymous publication.
The filtering is based on a mix of Bayesian classification, analysis
of external URLs, and a simple rule engine. We feel that its results
are accurate enough, even without having the poster's IP address