This is odd. I've been testing eNewsletter. I put myself in one of my groups so that I can receive messages that I send from the system. Each time I do, as soon as the message is sent, I'm then unsubscribed. Since this only happens to my user in an "admin" role, I assume this is working as designed? I have other email addresses I can use for testing, but I just wanted to verify that this is expected behavior.