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Fo this to work properly, you need to setup Shared SMTP NAmeSapce. &nbsp;Please have a read of the following article and setup your server accordingly:<br />
<a href="http://www.msexchange.org/tutorials/Exchange-2003-SMTP-Namespace-Sharing.html" rel="ugc">http://www.msexchange.org/tutorials/Exchange-2003-SMTP-Namespace-Sharing.html</a>&nbsp;<br />
&nbsp;<br />

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Fo this to work properly, you need to setup Shared SMTP NAmeSapce.  Please have a read of the following article and setup your server accordingly:
http://www.msexchange.org/tutorials/Exchange-2003-SMTP-Namespace-Sharing.html [http://www.msexchange.org/tutorials/Exchange-2003-SMTP-Namespace-Sharing.html] 
 


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As alanhardisty said the ONLY way to do this is to use a shared name space.<br />
<br />
I have to ask though, if they are in the same building why are you managing 2 domains/exchange unfastructures?
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As alanhardisty said the ONLY way to do this is to use a shared name space.

I have to ask though, if they are in the same building why are you managing 2 domains/exchange unfastructures?

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In my office, I have two domains and each domain has an Exchange 2003 server. &nbsp;One Exchange server has half of our users and the other Exchange server host the other half. &nbsp;Both servers host emails username@abcd.com. &nbsp;My routher forwards all incoming emails to one exchange server. &nbsp;How can I tell that server, if the mailbox is not found, forward the email to the exchange server in the other domain.<br />
<br />
Thanks,<br />
Jose
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In my office, I have two domains and each domain has an Exchange 2003 server.  One Exchange server has half of our users and the other Exchange server host the other half.  Both servers host emails username@abcd.com.  My routher forwards all incoming emails to one exchange server.  How can I tell that server, if the mailbox is not found, forward the email to the exchange server in the other domain.

Thanks,
Jose

Two Domains, Two Exchange Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.