Mail Fetch Deletion Not Working (IMAP & Groupwise)

Mail Fetch Deletion Not Working (IMAP & Groupwise)

Hello,
 
We are able to fetch email for the helpdesk account created for servicedesk plus, but it is not deleting the email so every time it fetches email it creates the same ticket over and over again....
 
Is there something I am missing here?  Why is the servicedesk plus server not deleting the incoming email once it fetches????
 
Thanks!
John
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