If someone has hit unsubscribe on one email account, but then asks us to send email to another email account, how do I override the unsubscribe?
UPDATE March 2017:
Emily, it is not possible to manually override the unsubscribe. The best option is to have your supporter sign up on your website. Create a signup page where they can use their additional email address to subscribe to your email list. This will create a second profile for them, but this is the only way to accomplish what you are looking to do.