@protonprivacy From "How to enable post-quantum protection in Proton Mail"[1] > Enable post-quantum protection > 1. Sign in to account.proton.me and open your account settings. > 2. Select Encryption and keys from the sidebar. > 3. Under Post-quantum protection, click Enable post-quantum protection. Where is the Post-quantum protection section? [1] https://proton.me/support/mail-post-quantum-protection