Mail filtering software using sendmail milter API
ze-filter is compatible with UNIX based mailservers running sendmail or postfix.
The goal of ze-filter is to be able to filter as much messages as possible, as fast as possible and as well as possible.
It's a complete and integrated solution including both behavioural filtering (connection rate control, detection of suspicious behaviour, greylisting , …) and content filtering (statistical/bayesian content filtering, pattern matching, URL filtering and heuristic filtering). ze-filter detects virus by looking for suspicious attached files (defined by their filename extensions or by some regular expression). An external message scanner such as Clamd (from ClamAV) can also be called during message handling.