If you think that's bad, Tutanota was forced by the court to change their SW, so that all incoming e-mails for a specific account would be intercepted before encryption: https://news.ycombinator.com/item?id=27303712
Hushmail had a similar warrant, they changed their login form so it would send the password in the clear to the server, which they used to decrypt the mail and logged all the traffic to help trace the user. If you get targeted these "anonymous" email services aren't going to be good for much in practice.
