Between proton accounts, mails are fully E2E encrypted. It’s just not a lot harder between different mail providers like Gmail and Hotmail. Proton does save the received emails fully encrypted, but that encryption has to be done on the server.
It is possible though, it just depends on tje sender/receiver: https://proton.me/support/proton-mail-encryption-explained




Just to make sure, uNlock or uBlock origin?