cannot send email to certain address via exchange server

Hi, I have a user who has outlook 2007 running on a 2008 sbs server, exchange 2007.

All of a sudden this one user gets a bounce back, with so far, 2 remote email address's from the exchange server.
But, one of our other users can send the email instead.
please see error report from server.

Delivery has failed to these recipients or distribution lists:
 
'user@supplier.co.uk'
A problem occurred during the delivery of this message. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message later, or provide the following diagnostic text to your system administrator.
 
  _____  

Sent by Microsoft Exchange Server 2007
LVL 1
total123Asked:
Who is Participating?
 
TheGorbyCommented:
Please try resending this message later, or provide the following diagnostic text to your system administrator.

Please post this diagnostic text for us to see.
0
 
total123Author Commented:
there is no diagnostic info or attachement, that is the only info in the responded email
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TheGorbyCommented:
That is very odd. Maybe viralthod's link can help you.
0
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