Hello! My name is*****I am a certified computer professional who will assist you.
To confirm, did you add your att.net e-mail account to a desktop e-mail program that came with the computer - called Mail, or you used another e-mail program?
Let me know,
It looks like you are using the Mail program that came with Windows 10. May I know if you have recently changed the password ***** your att.net e-mail account?
OK. Please check if you can access the att.net web mail interface with a web browser by going to this web page:
There sign in to your att.net e-mail account. Let me know if you could sign in, and if you could see the e-mails.