If you have contacts that were made automatically when you created new users, you can change your service and host commands to:Under contacts I only have notify-host-email selected, not xi_host_notification handler - what is the difference?
xi_service_notification_handler
xi_host_notification_handler
and remove the old commands.
But if you have contacts created separately from XI users I would leave everything as it is.
*If you choose to change the commands remember to enable notifications in that menu from my previous post, check appropriate alert types in Notification Preferences, and select Email in Notification Methods.
Also, please check your Notification management template in Admin/Notification management to make sure you don't have "UP" state embedded inside the code by accident.
PS We do have your system profile from December 2016. Did you have this exact issue at that time?