I'm a big fan of Progressive Insurance. But I'm not so much a fan of email newsletters lacking easy unsubscribe links. When you click on the "update preferences" link below, you're led to a password-protected profile center. You have to login to unsubscribe. Yet, this email isn't transactional; it is not a necessary part of my car insurance coverage.
Let's talk about a practical consideration. By making it anything-but-simple to unsubscribe, Progressive is tempting subscribers to hit the "this is spam" button, instead of bothering to unsubscribe. I'll bet you a dollar that their FBL complaint rates are elevated as a result.