Privacy Policy — Umbrel Mail Sync Umbrel Mail Sync is a private application used by its operator to access email accounts owned or administered by the operator. The application uses Google OAuth authorization to access Google Mail for the purpose of retrieving and sending email through a privately operated mail server. Google account data and email content accessed by the application are used solely to provide this functionality. This information is not sold, shared with third parties, used for advertising, or used for unrelated purposes. OAuth credentials and retrieved email data are stored on systems controlled by the application operator and are not made available to the public. Users may revoke the application's access to their Google Account at any time through their Google Account security settings. Contact: dr.churchill@gmail.com Last updated: August 31, 2026