SDM Change Order-Close, email notification is not working.

Document ID : KB000071570
Last Modified Date : 21/02/2018
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Introduction:
We are trying to set up a Close notification for Change Orders.
However, without success. The email notification does not work. 
 
Question:
How to get the Change Order 'Close-email-notification' visible for the user?
Environment:
Windows, running CA Service Desk Manager(SDM) r14.1. 
Answer:
The problem got resolved. 
As it appears that the Exchange-server decided to mark this 'closed notifications' as spam.