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Marketo tracks as the original addressee when a lead forwards the tracked email to someone else.
That is the primary reason most companies introduced the "forward to a friend" feature, decoupling the original email from its tracking token.
Your unsubscribe page could have language such as "If this isn't your email address, please change it to ensure you do not get any further communications from us". Won't stop everyone, but it may save you from losing a legitimate subscriber.