I get tons of messages from otherwise reputable companies (household names) that have no "unsubscribe" options because they consider the messages required for active account holders (and I'm not ready to close my account) but the messages certainly aren't triggered by a transaction that I'm party to. For example, banks will periodically inform me about how I should stay vigilant to avoid fraud, and all sorts of similar concepts. Any thoughts on whether this type of stuff violates CAN SPAM?