How to fix the issue of SBCGlobal email not working?

[sbcglobalinfo4]

SBCGlobal email may not be working: due to server issues, incorrect login details, poor internet connection, account suspension, browser problems, email client configuration, security software interference, a hacked account, or service outages. Verify login credentials, check for outages, and ensure proper account settings to resolve the issue.
https://www.infosbcglobal.com/