DarkMail Checker privacy policy
Last updated: October 13, 2026. Applies to DarkMail Checker 1.1.0 and later.
DarkMail Checker is a Chrome extension that shows unread Gmail messages for the Google accounts you are signed in to in Chrome. It has no servers. The developer never receives, sees or stores any of your data.
What the extension handles, and where it stays
| Data | Why | Where it is kept |
|---|---|---|
| Your Google account email addresses | To show each account and its unread mail | On your computer (chrome.storage.local). Addresses you configure in Options (labels to watch, accounts turned off) are part of your settings, see below. |
| Unread email details: sender, subject, a short snippet, date and message ID | To show the list, the unread count and notifications | On your computer (chrome.storage.local), replaced on every check. |
| The content of an email you open in the reading view | To display it | In memory only, while it is shown. Never saved. |
Gmail's session token (the GMAIL_AT cookie) and the account ID key from Gmail's page |
To send the quick actions you click (mark as read, archive, delete, spam, star) to Gmail | In memory only. Sent only back to mail.google.com. |
| Your settings | To remember your choices | chrome.storage.sync. If you use Chrome Sync, Chrome syncs them to your other computers through your Google account. |
Who the extension talks to
- Gmail (
mail.google.com) only. It reads your unread mail feed, sends the actions you choose, and loads a conversation when you open it, using the Gmail sign-in that is already in your browser. The extension's content security policy blocks connections to any site outside google.com (Gmail may redirect through Google's sign-in pages when your session needs renewing). - Images inside emails load only through Google's image proxy, the same way Gmail shows them. Images from other sites, and anything that could tell a sender you opened an email (tracking pixels, remote fonts, media), are blocked.
- When you choose to sign in, add an account, compose, reply or open Gmail, the extension opens a Gmail or Google sign-in page in a normal browser tab.
The extension has no analytics, no telemetry, no ads and no remote code. It does not sell, share or transfer your data to anyone, does not use it for anything other than showing your mail, and does not use it to determine creditworthiness or for lending.
Your choices
- Turn off notifications, sounds, previews or the right click menu in Options.
- Stop checking an account from the popup or Options.
- Removing the extension deletes everything it stored on your computer. Settings synced by Chrome Sync are removed from your Google account when Chrome next syncs.
Contact
Questions: open an issue in the project repository, or use the contact email on the Chrome Web Store listing.