c.Email protects your emails with end-to-end encryption, a highly secure communication process that ensures only the sender and recipient of an email can read it. 

Emails are encrypted on your device before sending, remain encrypted in transit, and are only decrypted on the recipient’s device. Nothing is ever stored, encrypted, or decrypted on our servers. This means no-one else can read your emails: not your email provider, and not us, even if we wanted to. 

The c.Email encryption protocol uses ML-KEM. This is a post-quantum secure system, which means it’s designed to resist attacks even from hypothetically powerful computers in the future. 

We encrypt your emails’ body and attachments, but not their recipient addresses or subject lines. This is to ensure you can search your entire email archive, rather than only emails stored locally.