Exchange 2010 emails bouncing within same domain

I have 2 users getting all emails to their own domain bounced. For example   User1@abcd.com in Phoenix sending to User2@abcd.com in Chicago will bounce.  But User1 can send to a different domain no problem.

Within the SAME local network the emails go just fine.

I believe there is a setting in Exchange 2010 needed for this but I can't recall.

Thank you!
dgrendaAsked:
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Alan HardistyCo-OwnerCommented:
If you are sharing the domain name across two servers, you need to configure the servers to be internal relay domains:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2555-Configure-Exchange-2007-or-2010-to-relay-email-for-an-additional-domain.html
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dgrendaAuthor Commented:
Domain email is hosted in Massachusetts. Exchange 2010 server in Phoenix pulls/sends email from the domain. But there is only one server in Phoenix, and the domain is  xxxxx.local   whereas the email domain we are discussing is xxxxx.edu  the email addresses used are xxxxx.edu

am i making sense?
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dgrendaAuthor Commented:
I recall a setting in Exchange 2003 that you had to get correctly in order to email another person in the same domain.

This is an SBS 2011 standard single server network.

Thank you for your help!
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dgrendaAuthor Commented:
That was it!
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