Unable to email out, bouncing back.

I have having trouble email out to one particular person.
( I do not know if it is specif to that user or all users on that domain)
All other email to other domains is fine.

The error that bounces back is:
Your message did not reach some or all of the intended recipients.

      Subject:      RE: 07 items - Adria.xls
      Sent:      11/10/2008 10:59 AM

The following recipient(s) could not be reached:

      xxx@xxxx.com on 11/10/2008 11:00 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <webmail.xxx.com #5.5.0 smtp;553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)>
itinsideAsked:
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RudramConnect With a Mentor Commented:
* Would you like to check the domain of the user whom you are trying to send emails whether it has been blocked or marked as an open relay for spammers

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_23853658.html

* You could even have a look for your domain too for conformity

Good Luck (^_^)
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