Aiah
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3,724 votes
We have given this quite a bit of thought, but at the present moment, it is not clear the advantages would outweigh the disadvantages.
The biggest problem is search. Encrypting all metadata would break metadata search entirely on the web client as there is still no efficient way to handle search of encrypted data within a browser.
Secondly, metadata encryption’s value from a privacy standpoint is also somewhat dubious. Because we ultimately must deliver the message to the recipient, we must know who the recipient is. At the current time, there still isn’t any proven and viable way to work around this.
Metadata encryption is an area of continued research for us, and when the opportunity arises and the technology for doing this matures, we will definitely implement it in ProtonMail.
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I very strongly agree with Oliver (June 12, 2015) who wrote that without encrypting metadata a mail service is not effectively private. I used to be a premium (paying) member of Protonmail because I wrongly assumed that both mail body & metadata were encrypted. Once I learned otherwise, I started treating my PM account like my Gmail account, assuming that if someone wanted badly enough to read my correspondences with my legal clients they could. Sadly (for my relationship with PM), now I have a paid subscription with another email provider that guarantees metadata encryption (also). If PM enhances its product, I'd happily subscribe once more.