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Add additional domain name to Exchange 2010 Server

Hey everyone.
My company recently acquired 2 other companies located in different cities. We want to add them to our current exchange 2010 server.

So, I have jason@domain1.com, which is working.
I want to also have jason@domain2.com, and jason@domain3.com.

If someone sends an email to any of those addresses, can they just all go into one exchange mailbox (jason@domain1.com).

I was following this:

 http://demazter.wordpress.com/2010/02/26/configure-exchange-2007-or-2010-to-relay-email-for-an-additional-domain/

but.. it doesnt work.

My A MX record points to webmail.domain1.com, do I need to create another MX record and point it to the same IP address?

Do I need to setup the child domain in my activedirectory?
Help! Ive never worked with multiple sites before, all my experience is in one site, one domain, etc.

Thank you for all your help!

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Mino DC
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add additional authoritative domain:

http://technet.microsoft.com/en-us/library/aa996314.aspx
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Ragu Ramachandran
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New-AcceptedDomain -DomainName Contoso.com -DomainType Authoritative -Name Contoso
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EZTEK

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@ rr1968:

I tried your steps, as they seem to combine all the necessary steps.
I have the MX record pointing to the same name as my domain 1.

Does it take a while for systems to recognize this change?
I sent an email to my test@domain2.com account, and it fails.

Is there a trace test to see if I am failing somewhere?
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Worked perfect! My DNS had to update.. and it took about a day or so