Instead of POP3, use IMAP.
Verify the Configuration Settings of SBC Global email account
After removing and re-adding your SBCGlobal Email Account.
Switch to Safe Window Mode in Outlook.
Make sure the antivirus is up to date.
Use Google's DNS service.
Follow above given steps to resolve SBCGlobal Email Not Working in MS Outlook
See Also this post:- https://www.datarecovo.com/how-to-fix-sbcglobal-email-login-issues/