[Teodolfo]

The user needs to control the encryption, not Google or Yahoo. Surely Google is not proposing a system that prevents them from reading your email and serving you ads? Until we have something that actually prevents Google and Yahoo from getting the plaintext, none of the other problems matter that much.

The NSA isn't my concern, Google etc. are. I don't want to bother going to the lengths necessary to secure myself from the NSA since that just isn't practical. But it would be nice if google and its employees didn't have access to the plaintext of my email. If I send an email to anyone using gmail and they decrypt it in a way that lets google see my text when they reply, all of my own security steps are worthless.