To know the steps for AT&T email settings for Thunderbird, check out the steps mentioned below: 1. Move to settings and tap on File and then to account settings. 2. Now, choose an email account for updates and select email settings. 3. Under the section, select POP and IMAP and make sure to enter the values correctly.4. After adding the AT&T email settings, tap on OK and next. Lastly, click on Finish. With this, you have smoothly configured the settings to complete or change AT&T email settings for Thunderbird.