When signing up new contacts, there is no clear indication of a contact already receiving emails. I added what I thought was a new contact, it asked me if I wanted to edit an existing email address or exit the entry. When I selected edit, it unsubscribed the contact with no way to reverse it.
A more pointed choice stating that the email address is already on the subscriber list and entering it again would likely un-subscribe the contact would be helpful.
... View more