Cannot Send Email to isolated user. Can send to others in same domain.

I'm using Exchange 2000 and Outlook 2003.  I keep getting a message saying that an email cannot be delivered to one user in a domain.

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.  recipient@domain.com.

I can send to others in the same domain with no problem.  Here's an interesting twist.  I was able to send an email to this user successfully through a telnet session their email server.  When trying to send normally through Outlook, I get the above message.  Any help would be greatly appreciated.
Bruce_StrattenDirectory, Information TechnologyAsked:
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David LeeCommented:
Hi Bruce_Stratten,

The notification message doesn't mean the item isn't going to be delivered, it simply means it's not being delivered within a given time frame.  TELNETing to their server isn't a fair test.  Their could be any number of intermediate hops your message takes and TELNETing  bypasses them all.  If you get an NDR advising that the message wasn't delivered or was rejected, then there's an issue.  Until then though it could just be congestion causing a delay.

Cheers!
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