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Domino and Exchange users duke it out

After my company was purchased last year, I had to support a mixed shop of Domino and Exchange users. At the time, there were four Internet domains -- two for the purchasing company (running Exchange) and two for my company (running Domino).

Since then, we have made one new Internet domain for all users in the company. However, since the new Internet domain is coming through the Domino server, the only way I could successfully forward e-mail to the Exchange server so that it is addressed correctly was to have a forwarding address in the Domino Directory of username@servername.domain.com. I also have the Notes/Exchange connector in place for internal e-mail.

My problem comes when a Domino user addresses an e-mail to an outside user and CCs an Exchange user, or even includes them on the TO: line. The outside user will then try to reply to the e-mail, but the Exchange user is addressed as username@servername.domain.com, which the outside user cannot reply to.

Is there any way I can have Domino change the outbound address to username@domain.com?

I have a Sendmail server in front of the Domino server, but it hasn't been able to accomplish this. It only looks at the sender's address. Thank you.
Instead of using the forwarding address, why not use the "Local internet domain smart host" in the server configuration document (under Router/SMTP Basics tab). That way, when the Domino server encounters an message for someone in your domain but not listed in your Domino directory, they would transfer it on to the Exchange server.

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