
Hushmail - ssshhh they could be listening....
"However, developments in November 2007 led to doubts among security-conscious users about Hushmail's security and concern over a backdoor. Hushmail has turned over cleartext copies of private e-mail messages associated with several addresses at the request of law enforcement agencies under a Mutual Legal Assistance Treaty with the United States."
http://www.wired.com/threatlevel/2007/11/encrypted-e-mai/
https://en.wikipedia.org/wiki/Hushmail