Scrubber

Homepage: http://projects.gasperino.org/scrubber/
Supports: libclamav
Scrubber is a server-side daemon for filtering mail content. It attempts to solve the issues that plague many server-side content filtering solutions such as extensibility, speed, SMTP-specific dependencies, and virtual hosting. The core of the project a client-server daemon that accepts raw content from SMTP-side client applications, breaking the message into MIME parts, and then sending the content through a series of loadable filter plugins to handle the message accordingly. The final message is sent back to the client-side programs for SMTP reinjection.