smtpprox

simple efficient SMTP proxy in perl
  http://bent.latency.net/smtpprox/
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Smtpprox is a trivial transparent SMTP proxy, an SMTP server and client combination.

The SMTP server writes the incoming message to a temporary file, which the SMTP client reads as the message to send. SMTP commands and replies are relayed without change for the most part.

For efficiency reasons, it pre-forks and serves from a pool of servers, Apache-style.