You are welcome. Another possibility is to create such a technical notification-user but don’t make him contact for anything. Create him as a regular user (no admin rights required), and disable his login. Then, in the notification rule, select just this particular user as a contact:
This approach is perhaps easier to understand. At least I thought so. Also, this avoids the following question: “How many POST requests are sent if multiple users are in the contact list for a problem?”