@davecb @evacide They are very clear in their marketing and documentation that e2e only works if you are sending between Proton addresses. They are more important as a Google alternative... I wish they would focus on that instead.
(Edit: to be clear, this is a response to @davecb . I know @evacide knows what she's talking about.)
@CAWguy @wcbdata @evacide Most eMail is encrypted in transit across the network/internet. SMTPS (SSL/TLS encrypted mail delivery using certificates for verifying identities & negotiating encryption keys) has been a thing for a long time.
It's the eMail provider that's the issue. Once the message is received, the server itself has a plain-text copy, even if the backend storage has filesystem-level encryption.
The real solution is for all eMail clients to have PGP/GPG, with a directory server that publishes public keys.
That way you can query the directory server with my eMail address, receive my public key, then encrypt your message with that key, and then it traverses all of the internet plumbing in an encrypted format that only the intended recipient can decrypt.
The percentage of people who do this is very, very small in the context of the entire internet.
@CAWguy Yeah, many years ago, I presented info about Signal to a nearby non-profit. Their President still sends stuff through SMS, even after having made it a requirement for their entire team to start using Signal.
The inertia of bad habits is very difficult to overcome.