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SBS exchange 2003

An internal user is trying to send an email to another user on the same domain but the 2nd user in not in the AD or in exchange but exchange gives a NDR without sending the email to the mail provider.

How can i get exchange to send the email to the mailprovider without adding the 2nd user to the AD and/or exchange?

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closed as not a real question by Scott Pack, Bryan, rnxrx, EEAA, Iain Oct 26 '12 at 8:32

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

You'll need to set up SMTP namespace sharing. Here's an article that explains how to do it in Exchange Server 2003:

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