How do I go about transitioning to a new email domain name?

Here is my scenario:

Currently, we have a domain, let's call it XXXX.  All of our email addresses however, are firstname_lastname@YYYY.org.  We'd like to transition our email addresses to @ZZZ.org.  The domain will stay the same (XXXX), just the email suffix will change.  However, we'd also like to keep @YYYY.org active for the external world who will obviously still be sending to @YYYY.org.

Is this just adding a new entry into the default recipient policy in Exchange?  Making @ZZZZ.org the primary, but still keeping @YYYY.org checked?  Any advice would be much appreciated!
mcascioAsked:
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Toni UranjekConsultant/TrainerCommented:
Hi mcascio,

Create appropriate MX record for new domain and configure Exchange to recieve mail for multiple domains.

"Configuring Exchange to receive mail for multiple domains"
http://support.microsoft.com/kb/268838

HTH

Toni

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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
"""Is this just adding a new entry into the default recipient policy in Exchange?  Making @ZZZZ.org the primary, but still keeping @YYYY.org checked?"""""

That is correct. Exactly what you need to do. You can create a new email address policy instead of editing the default one.
mcascioAuthor Commented:
thanks for the replies!
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