Disabling Email notifications for specific agent/admin

Hi,

Would like to know the structural differences between Agent and Admin roles and how we can prevent one of our "agent or admin" users from getting email notifications once a ticket is created or a change is made on it.

To better explain the scenario let's say there's a user with managerial observing role that does not need to be notified every-time a ticket is in or a change/comment is made.
How can we achieve that so the rest of the admins/agents will get email notifications but not that one specific "managerial" user.

Thank you.