MailStone Gmail Extension

Certify your emails on the blockchain directly from Gmail — in one click.

MailStone for Gmail automatically adds your MailStone certification address in BCC when you compose an email, so every message you send can be timestamped and anchored on the Blockchain — without changing your workflow. HOW IT WORKS 1. Open Gmail and start composing an email 2. Select your MailStone folder from the extension menu 3. The extension inserts the corresponding address in BCC automatically 4. Your email is certified and stored as legal evidence on MailStone servers WHY USE IT ✔ Legal-grade email certification (eIDAS qualified) ✔ Blockchain-anchored proof of sending ✔ No email content is ever read or stored by the extension ✔ Works entirely within Gmail — no copy-paste, no extra steps PRIVACY This extension does not collect any personal data. It only interacts with the Gmail compose window to insert a BCC address. See our full privacy policy at https://www.mailstone.io/terms