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c.Email
c.Email · London, United Kingdom
What it is
c.Email adds encryption and verified sending to an existing Gmail or Outlook address, so users can keep their current email account. The service offers an app and browser extension, including Chrome, and its free tier allows unlimited email addresses. Free features include end-to-end encryption, post-quantum security, verified sending, and For Your Eyes Only messages. Users can select Not secure, Secure, or For Your Eyes Only settings; the last requires continuous liveness verification from the intended recipient. Setup includes a one-time identity check using an existing ID and a liveness check, with identity data kept on the user’s device. Messages are encrypted and decrypted on sender and recipient devices rather than stored, encrypted, or decrypted on c.Email servers, except for a business exception. Its hybrid public-key encryption combines classical and post-quantum cryptography and uses ML-KEM, a standard published by NIST. c.Email is provided by Certonymity and built on cDot, a protocol for encrypted identity, email, messaging, and payments. Premium and business options are planned, with no listed prices.
For and against
For
- Free tier includes unlimited email addresses
- Works with existing Gmail and Outlook addresses
- Identity data remains on the user's device
- Offers three email security settings
Against
- Setup requires an ID and liveness check
- For Your Eyes Only requires continuous liveness verification
The verdict
c.Email combines existing email accounts with encryption and sender verification, with a free tier that includes unlimited addresses. Setup involves an identity check, and its most restrictive message setting requires ongoing recipient verification.
Who it suits
It suits people who want to add encrypted email and verified sending while keeping a Gmail or Outlook address. The For Your Eyes Only option may suit users who want recipient liveness verification for those messages.
Plans and prices
Free
Existing email address support · End-to-end encryption · Verified sending
Read 27 Sep 2026 · c.email
Business Plus
Read 27 Sep 2026 · c.email
Business Self-Serve
Read 27 Sep 2026 · c.email
Premium
Read 27 Sep 2026 · c.email
On the record
- Business compliance
- Business Self-Serve includes efficient compliance with data protection regulations.c.email · read 27 Sep 2026
- Business hosting
- Business Self-Serve can use the customer's server or a server included in the plan.c.email · read 27 Sep 2026
- Business teams
- Business plans provide protection for teams and organisations.c.email · read 27 Sep 2026
- cDot framework
- c.Email is built on cDot, a protocol for encrypted identity, email, messaging, and payments.c.email · read 27 Sep 2026
- C-layer network
- Public encryption and verification keys are stored on a distributed blockchain of independent nodes.c.email · read 27 Sep 2026
- C-layer status
- The C-layer is under development, and anyone can run a node.c.email · read 27 Sep 2026
- Company owner
- c.Email is provided by Certonymity.c.email · read 27 Sep 2026
- Encryption method
- c.Email uses end-to-end hybrid public-key encryption combining classical and post-quantum cryptography.c.email · read 27 Sep 2026
- Existing email
- Users keep their current email address and do not need to create a new account.c.email · read 27 Sep 2026
- Eyes Only protection
- For Your Eyes Only emails require continuous liveness verification from the intended recipient.c.email · read 27 Sep 2026
- Email addresses
- The free plan allows unlimited email addresses.c.email · read 27 Sep 2026
- Free features
- The free plan includes encryption, verified sending, post-quantum security, and For Your Eyes Only emails.c.email · read 27 Sep 2026
- Free pricing
- c.Email is free for all users and will always have a free tier.c.email · read 27 Sep 2026
- Identity check
- Setup includes a one-time identity check with an existing ID and liveness check.c.email · read 27 Sep 2026
- Email integrations
- c.Email connects with Gmail and Outlook addresses.c.email · read 27 Sep 2026
- On-device data
- Identity data is stored only on the user's device and does not leave it.c.email · read 27 Sep 2026
- Platforms and apps
- c.Email is available as an app and browser extension, including a Chrome extension.c.email · read 27 Sep 2026
- Post-quantum standard
- c.Email uses ML-KEM, the post-quantum standard published by NIST.c.email · read 27 Sep 2026
