Exchange 2003 two domains for email

I have one domain A record mail pointing to my ip address and mx record mail.mydomain.com. I want a second domain to point to the same server. I have a A record mail and a mx record that has mail.newdomain.com.  The mail manager has both domains and internally it's working fine. Externally I get an rejection email that says. xxx.xx.xxx.xxx (ip address) does not like recipient.
Remote host said: 550 No such domain at this location (payments@newdomain.com)
Giving up on xxx.xx.xxx.xxx (ipaddress) I have Sonic firewall pointing to a Barracuda Spam device then the exchange server.
earl_ITAsked:
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Tony MassaCommented:
The Barracuda device has to allow the new domain.

You also have to configure a new recipient policy (or change the default) to accept the same mail.

Then you have to add new proxyAddresses to AD users/groups/pub Folders.

http://technet.microsoft.com/en-us/library/cc164330(EXCHG.65).aspx
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Sikhumbuzo NtsadaSenior IT TechnicianCommented:
If you host your own e-mail then login to service provider like "godaddy" then add the new domain as accepted domain.
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earl_ITAuthor Commented:
Thanks, I forgot to add the domain to the Barracuda. Once I did that everything worked. Thanks for reminded me of that!
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