I've long since given up on this. I write email filters. I sign up for things under my Fake Name. Unsubscribing is an amazing crapshoot, especially when years later something you know you've unsubscribed from, because you have the email confirmation happens to send an "oops" email. Filtering email is the only thing that works, and ever since I adopted this approach I'm down to an average of zero marketing mails a week. I'll stay here.