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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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.
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