Open your AT&T Mail in a different web browser. For example, if you normally use Google Chrome, try Firefox. Verify that your browser accepts cookies. Then, clear your cookies and cache. You’ll find this info in your browser's Preferences, Settings, or Options menu. Enable JavaScript, and make sure it’s up to date. You’ll find it in your browser settings or options. Disable browser tools or add-ons to see if they’re causing issues with email access. To resolve ATT Email not Working, enable Adobe Flash Player, and make sure it’s up to date.