How do I control email notifications by user on a plan level?

We have numerous email notifications on for our Sheets based on due dates and prior steps being completed. These emails are sent out to individuals based on assigned tasks. We have a user who we recently added to the system and is assigned to tasks across a bunch of projects, but they are not ready to be fully functional in Smartsheet yet. They are getting a lot of email notifications that I would like to turn off for them until we get them up to speed. Is there a way that I can do this across all projects at once for this person while not interrupting everyone else's notifications?

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