you run that risk with any email account stored in a country where the government has established that they can demand access for law enforcement or national security reasons. that's...basically all of them.

that's great that you and that other guy can exchange encrypted email, but every other one of your contacts that have no clue what you're talking about can have their accounts accessed. see, again, Jacob Appelbaum, Birgitta Jonsdottir, and Rop Gonggrijp.