Exchange 2003: Recipient address rejected: No such user

I am trying to send an email from gmail, and other web email accounts and I am getting the following bounce back error messages:  What is causing this because I know the email addresses are correct that I am sending to?
Mail Delivery Subsystem <mailer-daemon@googlemail.com>  to me
 show details  8:05 pm (22 minutes ago)  
This is an automatically generated Delivery Status Notification
Delivery to the following recipient failed permanently:
    xxxxxx@domain.com

Technical details of permanent failure:
PERM_FAILURE: SMTP Error (state 13): 550 <xxxxx@domain.com>: Recipient address rejected: No such user (xxxxx@domain.com)
 
LVL 1
anthonycaAsked:
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mass2612Connect With a Mentor Commented:
Hi,

Are you able to send and recieve to this address to and from the internet at all? Try putting the address in here for testing.

http://www.zmailer.org/mxverify.html
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SembeeConnect With a Mentor Commented:
The error is not an Exchange message.
Do you receive email directly or via another host or device? Has the address ever worked? Anything recently changed?

Simon.
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kj7215Commented:
Love the zmailer verify.
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