It appears finding a message in junkmail and marking it as NOT SPAM does nothing inside SM.  I suggest either via a prompt or automatically when a message is marked as NOT SPAM that the email address is added to the user's trusted senders list.  We have options like this in Outlook (by address or domain) and I think SM should have this as well otherwise the same user will keep going into junkmail.

 

Using SM Latest (5801) Enterprise Edition.