MailStone Gmail Extension

Tracking since Apr 1, 2026.

Changelog

• Apr 30, 2026
  description

  Register your emails in the Blockchain thanks to MailStone ! This plugin allows automatically inserting your MailStone address in CC or BCC when using Gmail.

  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

• Apr 30, 2026
  short_description

  MailStone plugin for Gmail

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

• Apr 30, 2026
  name

  MailStone

  MailStone Gmail Extension

• Apr 30, 2026
  host_permissions

  (empty)

  https://mail.google.com/*, https://api-msv2.mailstone.io/*

• Apr 30, 2026
  permissions

  declarativeContent, storage

  storage, alarms

Permissions & access

Permissions

storagealarms

Host access

https://mail.google.com/*, https://api-msv2.mailstone.io/*

Screenshots

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