SMTP Preprocessor is advanced tool for mail
administrators. It enhances functionality of corporate
mail server. The program receives SMTP messages before
corporate SMTP server, on-the-fly changes or rejects
them, and retransmits result to the server. Wide range
of settings allows to improve security and add new
features to corporate SMTP server. SMTP Preprocessor
can 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 (Black
List) and transactions limit; reject RCPT command based
on recipient address (Private Recipients List),
recipient domain name (Anti-Relaying), sender address
(Restricted Senders List) and recipients limit; reject
out-of-order SMTP command; flexibly replace corporate
SMTP server response or any SMTP Preprocessor generated
response; replace sender in SMTP envelope (MAIL
command); replace recipient in SMTP envelope (RCPT
command). The program keeps adjustable detailed log of
all SMTP events.

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