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IP Tunneling for SMTP server on Windows 2008?

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http://serverfault.com – I have a Windows 2008 server that is running an SMTP server. The server has a public IP Address. I have 2 other windows servers, not in the same network, that are used for hosting client applications. We have a need to make sure that the emails sent through the client application to the SMTP server look like they originate from the original domains. Right now, everything is coming from our mail server domain. So the traffic flow would look like this: A request is made to www.test.com on port 25 to send mail. www.test.com routes the request to our SMTP server. The SMTP server (mail1.smtpserver (HowTos)