Pocket PC returns error "550 No such domain..." for external email addresses

We use exhange server 2003 and windows server 2003. iPhones can send and receive emails very well. The pocket PC receives emails from any domain, and can successfully reply to internal emails. However, if an email is sent to an external email address, the message below is received (note that I have used "external@email.com" to replace a yahoo email address. All external email addresses are affected).

-----Original Message-----
From: System Administrator <System Administrator>
Sent: Tuesday, July 07, 2009 1:11 PM
Subject: Message not sent

The message 'RE: test email' was not sent and has been moved to the Drafts folder.

The server returned the following error message:

550 No such domain at this location (external@email.com)

The following recipients did not receive the message:

external@email.com
bobox00Asked:
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Alan HardistyCo-OwnerCommented:
Does this previous EE question answer your problem?
http://www.experts-exchange.com/Networking/Protocols/DNS/Q_22854289.html 
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bobox00Author Commented:
The link you provided certainly helped. I created an authorized user relay entry on my Barracuda spam filter, using the user's email address. Working fine now!
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Alan HardistyCo-OwnerCommented:
Excellent - it did seem a likely solution, but you never know.
Glad you are working now and thanks for the points.
Alan
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