This version is no longer maintained here, please see www.firetrust.com for the latest versions
MailWasher Server is a highly accurate server-side spam filtering package with a polished, well-integrated web interface and built-in quarantine management facilities. Fully supports Windows Server/Exchange Server, Linux and Solaris.
SPAMGrinderProxy is an SMTP and POP3 spam filter that runs as a service on Windows XP/2K. It works with any server or client, scanning each message for SPAM and flagging those that are. It can interoperate with SpamAssassin or use its own filters.