SMC anti-spam e-mail milter (plug-in) is an software application designed to significantly reduce the amount of SPAM/UCE (junk-mail) you receive. SMC uses a greylisting like technique to stops the junk-mail and a set of dynamic auto "whitelists" for unknown, but legitimate senders.

SMTP Preprocessor is advanced tool for mail administrators. It receives SMTP messages before corporate SMTP server, changes or rejects them on-the-fly, and retransmits result to the server. Wide range of settings allows to improve security and functionality of corporate SMTP server. The program keeps adjustable detailed log of all SMTP events, supports Greylisting, Tarpitting and some other technologies of mail filtering.