Overview
- Proton Mail introduced optional post-quantum protection for every account, including free users, with immediate availability.
- After users enable the feature, Proton generates new quantum‑resistant keys for future encrypted emails, leaving existing messages as they are for now.
- The rollout adds OpenPGP v6 support to enable modern algorithms while keeping current RSA and elliptic-curve encryption in place.
- Proton says it is working with the open email ecosystem, including Thunderbird, to make quantum‑safe email work across providers.
- Users need up-to-date Proton apps to use the new keys, and enabling the feature pauses encrypted forwarding and may cause a small performance hit.