An outlook is a platform introduced by Microsoft to manage all essential data at one place. The software often gets updated with the latest versions, this recent 2013 launch of Outlook comes with different settings for ATT.NET email.
Your outlook will auto-connect with IMAP account with all connected settings.
Note: If you use Secure SSL / TLS Settings, check the “This service requires a secure connection (SSL)” box in both outgoing and incoming mails.
Once you are done with the above settings
After following steps, If you are still facing any issue setting up ATT.NET Email on Outlook 2013, Contact Emailfix.com chat experts to resolve the issue.