One user unable to send to a Distribution List

Hello.

We have Microsft Exchange Server running on Windows Server 2003.
I have a user running Outlook 2007. He is able to send emails to all Distribution lists except for one.
When he tries to send to this DL the mail goes into his Sent items but it is not delivered to any of the members of the DL.
He does not get a bounced back mail.
I have tried deleting this DL and recreating it but he has the same problem. The workaround I'm using is to send the mail to the DL on the users behlaf but this is not ideal.
Can anyone help with some wat to troubleshoot this?
Thanks
cah00tsAsked:
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tenaj-207Commented:
I have just a couple of ideas for you to try.

What if you split the DL in half and try narrowing down to see if the issue is with a specific email address.

Have you tried emailing the DL from OWA?

Have you looked at the smtp queue after you've sent the email?

Have you checked for any event logs on the server and the computer?

Have you tried the DL from another computer with the same user account?
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cah00tsAuthor Commented:
Thanks for the response.
I've tried emailing it from OWA, no joy.
I don't know how to check the smtp queue, will look that up.
I've tried from my own computer with the same user account but no luck.
I have not checked the event logs I will do that and if I don't find anything I'll start splitting the DL, that's a great idea, I reckon it must be a particular email address that's causing the problem.
Thanks for your help.
 
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tenaj-207Commented:
cah00ts,

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