[chuckadams]

Individual emails are only encrypted if the sender encrypts them, yes, and it's only enabled by default between protonmail users. However, the mailbox as a whole is encrypted at rest with some one-way method that doesn't allow proton to decrypt it: https://proton.me/blog/zero-access-encryption

[aquatica]

> However, the mailbox as a whole is encrypted at rest

The server still receives from other servers and from the client (if the email is not going to a proton account) the plain text, so nothing prevents them from making a copy.

[chuckadams]

email is not Signal, and Proton cannot magically turn on encryption for every sender in the world.

[riku_iki]

how other providers (gmail) work in this case?..