ATT email has a login problem.
Outlook has a problem with incorrect settings.
Switch off antivirus software that was installed by a third party.
Clear the Cache and Cookies in Your Web Browser
Changing The Password
Safe Mode should be allowed.
Read more here:- https://www.datarecovo.com/fix-att-email-not-working-problem/
See Also this post:- https://www.bloglovin.com/@datarecovo/simplest-ways-to-fix-atandt-email-login-problems-8583231
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AT&T Mail account and settings
Having issues with your email? Try these tips.
Make sure your email:
Meets maximize message size limits.
Includes the correct recipient email address. If it doesn’t, you may get error messages like Failed Delivery or Problem Found - Message Not Sent.
Sign out of your email account, and then sign back in.
Check your spam folder for missing messages.
To review your settings, select the gear icon:
Blocked addresses: Make sure you aren’t blocking addresses you want to get email from.
Filters: Make sure emails are going to the correct folder.
Confirm you haven’t been hacked. Your account may be compromised if you’re:
Missing emails
Getting emails from your own email address
Getting complaints about spam coming from your email address
Seeing a display name that's different from the one you set up
Learn what to do if your email has been hacked or phished.
Connectivity or browser issues
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.
Enable Adobe Flash Player, and make sure it’s up to date.
Check your firewall, antivirus, and anti-spyware settings. Sometimes they conflict with email and web browsers. Disable them one at a time and try accessing your email. Don't forget to turn them back on once you know they aren’t causing the issue.
Regards,
Bruce