this post was submitted on 26 Feb 2024
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Sort of, but not entirely. They use E2EE for message contents, so they would not be technically able to hand over that data (assuming their E2EE system is not compromised). However, they do NOT use E2EE for email headers, which includes email subject lines, recipients, and other metadata.
From https://proton.me/support/does-protonmail-encrypt-email-subjects:
From https://proton.me/support/proton-mail-encryption-explained: