c.Email: Secure Email

Certonymity Ltd

About this app

c.Email lets you send end-to-end encrypted, authenticated emails from your existing address. It works instantly with providers like Gmail and Outlook — no new account required.

With c.Email, you can:
- Protect your emails from surveillance and hackers.
- Instantly detect suspicious emails and scams.
- Lock your emails with biometric authentication — they re-encrypt if you look away.
- Use the same email you always have, but with added privacy.
- Get a reusable age proof to anonymously pass age verification.

Get started in minutes to protect your emails from surveillance, scams, and impersonation.

Key features:

END-TO-END ENCRYPTION
Post-quantum secure encryption keeps your emails private.
Emails encrypted and decrypted on-device, never on servers.

AUTHENTICATED EMAILS
Verified sending guarantees you know who a message is from.
Emails show the sender’s real name, verified with cryptographic proofs.

UNIQUE ‘FOR YOUR EYES ONLY’ SETTING
Turn on to make sure emails are only decrypted when the intended recipient is looking at the screen — as soon as they look away, the email re-encrypts.
For Your Eyes Only emails are protected against screenshots/screen recordings.

WORKS WITH ANY EMAIL
Get started in minutes with your existing email address.
No migration process or technical knowledge required.

PROTECTION AGAINST HACKERS
Only you can send or read encrypted emails on your account.
Even if someone guesses your password, on-device authentication prevents them from impersonating you.

DATA PRIVACY BY DESIGN
Identity proofs work through cryptography, not by storing user IDs.
Your personal data is only ever kept on your device.

Combining advanced cryptography with real-world identity verification, c.Email exists because privacy, safety, and convenience shouldn’t be mutually exclusive.

What’s new

New compose UI