Proton Mail on Nostr: npub17zv95…6u6ek Yes, we use the open-source, battle-tested PGP encryption, which ...

npub17zv95654dc4u0vpyvvgne3ttas4zhsxy56kts73ca0ywzy0qn9fqy6u6ek (npub17zv…u6ek) Yes, we use the open-source, battle-tested PGP encryption, which currently doesn't cover email subject lines and titles of attachments: https://proton.me/support/does-protonmail-encrypt-email-subjects.

Regarding the email headers, they need to remain unencrypted for the email service to function properly. Additionally, headers don't contain IP addresses.