How to configure Exchange 2003 to handle mail from an external domain

Here is the scenario:

I have 2 Exchange 2003 Servers in my domain:
We also have a subsidiary company (with different name: operating within the same building and connected to our network. However, their email is being hosted by an outside company and forwarded to (our email system).

They have numerous problems with their email system, so they want us to host/manage their email, but no as, but as theirs,

How do I setup one of my exchange servers to host/handle their emails separately as and not as, so they can receive and send emails as

Any Ideas?
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alexbozaAuthor Commented:
First, I appologize for taking so long to get back with you. I got very busy yesterday.

James, thanks a lot for pointing me into the right direction. That link worked just great for me. It was the perfect solution.

Glad to help.  I had to do a similar operation recently and that was what helped me through as well.
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