Company name change - adding a domain to Win Server 2003

Due to the renaming of our company, I need to change everyone's email address to reflect the change.  
Our current internal domain name is the same as our current internet domain.  I've been searching around for the best answer as to how to facilitate this.  I'm not sure weather I need to create an additional domain, a new forrest and domain, or if there's a way around all that.  I've read up on a solution from the Exchange section that discusses a change to the Recipient Policies, but I don't think that will cover both the sending, AND recieving of mail.  Thanks.
lessthan2Asked:
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Netman66Commented:
OK, did you also set his email alias on the account in AD?  You'll need to do this from a machine with the Exchange tools on it so you can see the tabs in ADUC.

You'll need to make sure his account is connected to a valid mailbox and that both his email addresses are there.  The Exchange will setup a mailbox with the original domain - you have added RUS entries, now just add the extra account.

Sorry if I'm repeating myself.

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joedoe58Commented:
Are you going to change the name of your AD domain too or just make a change of email address?
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lessthan2Author Commented:
My main concern is getting email in and out of here such that the 'From' field displays the new domain.  I want to do whatever is the best thing to accomplish that.  
Also, as an aside, I have a bad feeling about renaming the current domain.
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Netman66Commented:
Joe's on the right track.  You can add another UPN suffix to your current domain, then change the accounts to use the new suffix, then add the new email to the users in ADUC.

Here's an article:  http://support.microsoft.com/default.aspx?scid=kb;en-us;243629
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lessthan2Author Commented:
Thanks guys.  It looks like we are almost there, and this is probably becoming a question for the Exchange forum.
I entered the UPN value in my Recipient Policies (Exchange 2003).  Now I have: '@currentDomain.com' AND '@newDomain.com' in that policy.  I allowed it to set all users with the
newDomain.com value.  I checked DNS to make sure the MX record was pointing correctly.  Next, I set a testuser account to use the newDomain value as its' primary.  Ran a test against testuser@newDomain.com from CentralOpts.net.  Getting an error of "mailbox unavailable".  This could be a disconnect somewhere in here (SPAM filter, firewall, etc), which would be my problem, but I wanted to see if you guys can spot a hole in my preparations.
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lessthan2Author Commented:
Yes sir.  I got it working a few moments ago.  Thank you all for your help.
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Netman66Commented:
Anytime!
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