Learn how to connect your Gmail account to ThunderSweep
When connecting your Gmail account to ThunderSweep, you MUST check both permission boxes for the extension to work properly. Missing either permission will cause the extension to fail.
ThunderSweep requires the following two Gmail permissions:
📸 Screenshot: Gmail OAuth consent screen showing both checkboxes checked
(You'll see this when connecting your account)
What it does: Allows ThunderSweep to read email metadata (sender, subject, date)
Why we need it: To identify which emails have attachments and scan for sensitive information
What we DON'T do: We never read your email body content or collect personal data
What it does: Grants access to download and analyze attachments
Why we need it: To scan PDFs, documents, and files for sensitive data (tax forms, SSNs, medical records)
What we DON'T do: We never send emails on your behalf or modify your emails without your explicit permission
Solution: Make sure BOTH boxes are checked when connecting your account. Go back and re-authorize with both permissions enabled.
Solution: Disconnect and reconnect your account in the extension settings, ensuring both permissions are granted during the OAuth flow.
Solution: This is normal after extension updates. Re-grant both permissions to continue using ThunderSweep. Your previous scan results and settings are preserved.
Solution: Click "Advanced" and then "Go to ThunderSweep (unsafe)" to proceed. This warning appears for new or unverified apps. We're working on Google verification.
📧 Email: [email protected]
🌐 Website: https://thundersweep.com
Last Updated: February 2026