In case you have an account on att.net email and you unable to access your own email account then you have to do these steps and your issues will be fixed. Just check your internet connection, then check your email address and password carefully, clear device cache, then again try to login att net email account.
You can also read this blog and get more information: https://blog.storymirror.com/read/lvj3lmre/how-do-i-access-my-at-t-email
Go to your browser’s settings, and then to the ‘privacy and security’ to clear your browser cookies and cache.
Go to your browser settings and reset your browser.
Go to a different web browser like ‘Firefox and Google Chrome’ to open your AT&T email account.
Disable any add-on browser tools.
And, check your antivirus or firewall settings as they sometimes conflict with your email account and browser. So, if they are the reasons behind your AT&T email login problems then disable them and then try logging to your account.
For Incoming Mail Server:
Type of server: IMAP
Name of server: imap.mail.ATT&T.net
Security type: TLS/SSL
Port Number: 993
For Outgoing Mail Server:
Type of server: SMTP
Name of server: smtp.mail.ATT&T.net
Security type: SSL/TLS
Port Number: 465