ClamCour is a multi-threaded Courier filter that allows Clam Antivirus to scan incoming mail for viruses, and rejects it if the check is positive. Attachments can be "quarantined", and custom domain-based email reports can be sent.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.