You can't do this really, what you need to do is rewrite your notification scheme, or the user's groups/roles in such a way that they no longer match the rules that send them the emails.
If that user really really does not want to receive any notifications at all (as in nothing), update the account's email address to something else.
A lot of places implement a "null" email address so that systems simply bin anything sent to it. You should use something like that to avoid errors in logs if you're going to go with using a different email address.
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