this post was submitted on 17 Feb 2024
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ProtonMail uses PGP encryption to encrypt emails, which means your meta data, including subject line is vulnerable to data collection. Also there is no forward secrecy with current PGP standard. See quotes from below:
https://proton.me/support/how-to-use-pgp
https://proton.me/support/proton-mail-encryption-explained
PGP (especially for email) exposes much more info to outside party than any good communication protocol, like the signal protocol or OMEMO used by XMPP.