I would also really like the ability to associate multiple email addresses. I'll just add that this is one of those features that is common enough that users expect it. Dropbox, Trello, most social media services...they all allow you to do this. Sometimes that's reason enough to add a feature so you stay current. I just shared a note with a colleague who I know is an Evernote user. Because I chose her work address from the list that appeared, she received the note, but it wasn't linked to her Evernote account. I had to share it with her again once she told me her personal address was on her account.