Issue: Customer reported “Internal support function returned an error sending to Distribution list”
Resolution:
There is a duplicate, one-off contact in the DL, containing the Internet address for a member of the Microsoft Exchange Server Global Address List (GAL).
Do not use the identical display name for one-off contacts in a DL that also have Internet entries in the GAL.
Customer is advised to re-create the distribution list in Outlook
Ex-Shell 
Every time I come to another interesting #hostname posted. Several weeks ago a friend of mine was talking to me about this subject, so I think I’ll e-mail them the URL here and see what they say.
IT support Dallas
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