Database mail not sending no error messages

Question

SQL server 2008 R2
Database mail was up and running until sometime last week.  It seemed to quit in the middle of a long list of emails.  We had network issues at this same time that might have contributed to the issue.
Everything checks out ok today but I cannot send a test email.  I do not see any error messages or 'db mail starting up' messages in the log.
I do see the Email in the sysmail_unsentitems view.  
I do not receive any error messages.
I tried setting up a secondary account and that did not make a differnce.
I tried stopping the mail service with EXEC msdb.dbo.sysmail_start_sp  and the query never completes.  I canceled after > 5 minutes 
I deleted many unsent and one retrying message from the queue.  I see those actions in the log. 
Is there any thing else I can try?
KD

Answer 1

Have you worked through the troubleshooting steps in the following BOL Topic to validate that the external executable is activating, and the queue status is correctly returning RECEIVES_OCCURRING:
http://msdn.microsoft.com/en-us/library/ms187540.aspx
Also have you tried increasing your retry configuration parameters to handle the larger mail queue that you are sending through?
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