Do opt-ins/-outs, preferences and unsubscribes apply to the individual person or to a single email address? Wondering from a legal and/or best practices standpoint: Let's say a person ("John Smith") subscribes (opts in) to one of our newsletters with the email address john.smith@somecompany.com. We also have the email address johnsmith@gmail.com on file for him (not due to subscribing, per se, but perhaps an old customer record). If john.smith@somecompany.com bounces later on, are we allowed (legally and/or ethically) to update his invalid email address in Marketo with johnsmith@gmail.com, the other one we have on file? Or would John Smith have to actively request/opt-in with johnsmith@gmail.com?To further complicate the scenario, what if John Smith unsubscribed via a link on an email sent to john.smith@somecompany.com? In a country like the US where opt-in is not required, could we update his email address in Marketo to johnsmith@gmail.com since he has not yet unsubscribed for that email address? Or is that not ok since we know it's the same person? Are opt-ins and opt-outs tied to an indiv
