E-MailRelay

What is it?

E-MailRelay is a simple store-and-forward message transfer agent and proxy server. It runs on Unix-like operating systems (including Linux), and on Windows.

When used as proxy server the E-MailRelay program (emailrelay) runs in the background and accepts e-mail from local e-mail client programs (KMail, Outlook etc.) or from the outside world, using the SMTP protocol. As soon as an e-mail message is received it is forwarded on to the next SMTP server for onward delivery. This becomes more useful when you add in your own message processing: as each message is received it can be passed one of your programs for editing, filtering, encrypting etc.

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Or my local copy Version 1.9 EmailRelay