We recently had a situation where a teacher needed compassionate leave.  We decided to stop all notifications to them from all our systems, so they were not being emailed from work during a difficult period.  With Canvas the only way I could find to do this was to act as the teacher, screenshot their notification preferences and turn them all off.  I will do the reverse on their return to work.

 

It would be good if admins had the ability to suspend all notifications to other users, teachers and students for set periods of time.