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.

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipients has been delayed.

       externaluseremail@domain.com

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.
bobox00Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

MesthaCommented:
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?

Simon.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
bobox00Author Commented:
I have sent test emails to the two recipients involved. I'll let you know as soon as I get a response.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Outlook

From novice to tech pro — start learning today.