How to find out if user has unsubscribed from notification

Is it possible for the sheet owner or admin to find out if a recipient for email notification has chosen to unsubscribe from notification?

We have an application where notifications are sent to recipients external to our organization (ie. customers), and an account manager would like to know if their customer contact has chosen to unsubscribe from the notification (by clicking on "Unsubscribe" in the small text at the bottom of notification email).

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