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@PlexSheep@infosec.pub I don’t think you understand how Proton stores email on their servers. STARTTLS, imaps, and smtps all encrypt during transport, but would require the server to have a decrypted copy. Since they use zero-access encryption to store emails, that’s not possible.
See https://proton.me/support/proton-mail-encryption-explained
@sunred @piracysails Yeah, because they can’t decrypt your email, they can’t really provide it over IMAP. https://proton.me/support/proton-mail-encryption-explained has more details.