How, if at all, do you enable leads to update their email addresses on file in a way that associates the new email address with the existing record? Is done it via a separate portal that feeds to Marketo? Does a staff member manually update Marketo records if/when the person replies to an email asking that their contact info be updated? Do you not worry about it and the person just has to subscribe with their new email address (creating a separate record in Marketo)? Curious as to what others are doing.