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Proton’s Lumo AI chatbot: not end-to-end encrypted, not open source
(pivot-to-ai.com)
This is a most excellent place for technology news and articles.
You would not be able to retrieve your mails using IMAP from a regular mail client if they were doing that. You can even retrieve them from Gmail, which is unlikely to support any kind of "bring your own private key to decrypt mails from IMAP".