this post was submitted on 26 Feb 2025
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Proton does not use end-to-end encryption for email headers. That includes the subject lines, senders/recipients, and other potentially sensitive information.
Tuta uses E2EE for email contents AND headers.
Consider for a moment what someone with access to your contacts and subject lines would know about you. For me personally, they would know which political campaigns and causes I donate to, and when. They would know when I see various doctors, and who they are. They would know my travel dates and destinations. They would know what newsletters I read (many of which are also political). Etc.
Sender and recipient can't be encrypted e2e. How would the server know to whom deliver the email if those are encrypted and not visible to it?
AFAIK tuta encryption extends to the subject line only.
Still a nice addition, don't get me wrong, but I believe you misunderstood something.
From their own doc:
Contacts and everything else is encrypted similarly in all "secure email" providers, including Proton.
Tuta it is then.