I read about this a few weeks ago and I'm still on the waiting list for a beta key. They had a million sign ups in the first few days and exhausted their servers, demand is pretty high. So they set up an IndieGoGo campaign to get this to more people. They've reached their goal already after just a few days.
ProtonMail is end to end encrypted webmail developed by research scientists at MIT and CERN. It aims to make email simple and secure by hiding away all of that nasty encryption stuff and doing it for you
ProtonMail was founded in summer 2013 at CERN by scientists who were drawn together by a shared vision of a more secure and private Internet. Early ProtonMail hackathons were held at the famous CERN Restaurant One. ProtonMail is developed both at CERN and MIT and is headquartered in Geneva, Switzerland. We were semifinalists in 2014 MIT 100K startup launch competition and are advised by the MIT Venture Mentoring Service.
Or if you don't like the idea of someone else controlling stuff there's still Mailpile https://www.mailpile.is/