Exchange email address when in a child domain

Hello.
We are setting up a new Windows 2008 forest with child domains.
We named the top domain "foo.com" and the children domains "sales.foo.com" and "finance.foo.com" .  

We will be installing an Exchange 2010 server at the "foo.com" level and at the "sales.foo.com"

Attached is a diagram of the domain layout.

User mailboxes will be located at the "sales.foo.com" level

My question is as follows:

How can I keep the "sales.foo.com" domain name from being in the email address? My goal is to have the email address end with "foo.com".

Example:  I have a user (mwilson) with an account and email box in the "sales.foo.com" domain. I do not want their address to be "mwilson@sales.foo.com", I want it to be "mwilson@foo.com"

I'm sure this is possible, I just want to know how to do it.
Thank you in advance!
domains.bmp
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CanHasCheezburgerAsked:
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Stelian StanNetwork AdministratorCommented:
You need to create a policy for that: http://technet.microsoft.com/en-us/library/bb232171.aspx

How to create an e-mail address policy: http://technet.microsoft.com/en-us/library/bb125137.aspx
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CanHasCheezburgerAuthor Commented:
Thank you very much!
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Stelian StanNetwork AdministratorCommented:
Glad I could help you!
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