OpManager 8 can't email distribution list?

OpManager 8 can't email distribution list?

Hi all,
I have OpManager 8 configured to email me when a device I'm monitoring stops responding, and that works perfectly.  When I go to the notification profile and tell it to send a test email, the email arrives immediately.  I just had our Exchange admin create a distribution list or distribution group so that I can email more than one person when a node goes down, and when I try to email that group from OpManager, the email does not go through, even though it announces that the email was sent successfully. 
As a test, the Exchange admin had me try from OpManager a distribution list that has been in place for months, and the results are the same -- the email does not arrive.  When I email either distribution list from within Outlook, the email goes through immediately.  Our Exchange system is 2010 sp1.  Has anyone else seen this issue?
TIA
Brian
 

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