Outlook user getting Delivery Status Notification (Delay)

We use Exchange 2003 server. Lately, a user first received a set of error messages, similar to the one below, when sending to some external email recipients:

Subject: Delivery Status Notification (Delay)

This is an automatically generated Delivery Status Notification.



Delivery to the following recipients has been delayed.


He reported this to me (he was able to email me). Later, he sent me error messages, similar to the one below, for the same emails he had earlier complained about:

Subject: Undeliverable: Delivery Status Notification (Failure)
Your message did not reach some or all of the intended recipients.

      Subject:      Original email message subject

The following recipient(s) cannot be reached:

      Recipient Name on 5/21/2009 8:53 PM
            Could not deliver the message in the time limit specified.  Please retry or contact your administrator.
            <ourexchange.serverfqdn.com #4.4.7>

What could be the problem, and how can I rectify it please? Thanks for all responses in advance. The user has Office 2007 and Vista. Only one user has reported this problem.
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Those are timeouts. Do not really say why there is a problem at all.
Timeouts can be caused by all sorts of things, most of them out of your control.

Any patterns? Can any other users send to these recipients and/or domains?


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bobox00Author Commented:
I have sent test emails to the two recipients involved. I'll let you know as soon as I get a response.
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