SMTP Preprocessor 1.10
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.