> end-to-end encrypted mail just works from a proton to a proton address. This is no longer email, it's a proprietary messaging platform. They offer email to o

> end-to-end encrypted mail just works from a proton to a proton address. This is no longer email, it's a proprietary messaging platform. They offer email to other email providers, and encrypted messaging to other protonmail users, and they bundle both message types into your email inbox. Signal could bolt on an email transport to allow you to send and receive emails from Signal and that would be the same: communications within Signal would be encrypted, communications to external email servers would not be (any more "encrypted" than, say, gmail is).