I need to create a hidden account on the domain only for sending notifications.

[Anthony-123]

We have a server that needs to send notifications when an action occurs. How might I create this M365/AAD user so that it's hidden from the domain and isn't included on any distribution lists or org-wide groups, etc.?   

Any security tips on how to protect this not-monitored account? 

EDIT: I ended up adding the user to another domain (user@another.domain.com), hiding them from GAL (option right at the top of Exchange Admin), and, more importantly, I found the Group membership option to remove users from a Group so they don't receive org-wide emails. Everything right within the setup at the Exchange Admin site. 

[#2]

Best would probably be to just set the account to be hidden from the GAL but likely doesn’t make it fully ‘hidden’ though. For information on how to do so, have a look at https://docs.microsoft.com/en-us/exchange/address-books/address-lists/manage-address-lists#hide-reci...