SMTP Preprocessor - Version 1.00 SMTP Preprocessor is advanced tool for mailadministrators. It enhances functionality of corporatemail server. The program receives SMTP messages beforecorporate SMTP server, on-the-fly changes or rejectsthem, and retransmits result to the server. Wide rangeof settings allows to improve security and add newfeatures to corporate SMTP server. SMTP Preprocessorcan reject connection based on remote host IP address(Black List), presence of reverse DNS PTR record,validity of HELO or EHLO command and connections limit;reject MAIL command based on sender address (BlackList) and transactions limit; reject RCPT command basedon recipient address (Private Recipients List),recipient domain name (Anti-Relaying), sender address(Restricted Senders List) and recipients limit; rejectout-of-order SMTP command; flexibly replace corporateSMTP server response or any SMTP Preprocessor generatedresponse; replace sender in SMTP envelope (MAILcommand); replace recipient in SMTP envelope (RCPTcommand). The program keeps adjustable detailed log ofall SMTP events.