Such end-to-end security is what Levinson is more or less promising in part with his future project Dark Mail, a combination of open mail-handling protocols on the server side and open source software for end-users. But Dark Mail is no more than an idea right now, and a lot of work would be needed by many parties to make it happen.
Both men are in agreement about one detail: Email is inherently insecure and needs to be reworked from the ground up. How that'll happen is where they part company -- but nothing says they couldn't join forces in the future.
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