Email notification doesn't work

Hi experts,

I have email extension installed. I create a thing "MyMailServer2" based on it and it works if test it with script. 

However, it doesn't work when I create a entity Notification "EmailNotify" and set  "MyMailServer2" as the handler.  I have no clue about it , could you help ?  

===================Updated on Feb 9==============

I didn't figure out the problem above , then I tried to turn to script to send email. So I need to get the recipients defined in the Notification.  I can get the notification content "testNotify" by running the service "GetNotificationContents",  While executing the service "GetUserRecipientsOfEvent" , it tells me no notification conent found(see the Capture5.PNG) .  Any idea about it ? 

The Thingworx I installed from : twxFoundationH2Trial-8.3.2-windows-installer.zip

Version of email extension: 3.6.0

Regards,

Sean

Thank you