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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.
Scribe can be local, if that's what you are referring to.
They also have a specific section on it at https://proton.me/support/proton-scribe-writing-assistant#local-or-server
Also emails for the most part are not e2ee, they can't be because the other party is not using encryption. They use "zero-access" which is different. It means proton gets the email in clear text, encrypts it with your public PGP key, deletes the original, and sends it to you.
See https://proton.me/support/proton-mail-encryption-explained