Automatically and invisibly encrypt email as soon as it is received on any trusted device

From helpnetsecurity.com

Easy Email Encryption — **What users see E3 as their insecure email + their devices = secure encrypted email.**

While an empty email inbox is something many people strive for, most of us are not successful. And that means that we probably have stored away hundreds, even thousands, of emails that contain all kinds of personal information we would prefer to keep private.

Current defenses, such as Pretty Good Privacy (PGP) and Secure/Multipurpose Internet Mail Extensions (S/MIME), rely on public key cryptography that uses pairs of public and private keys generated by cryptographic algorithms.