In the Incoming Mail (POP3 or IMAP) Server field, enter.In the Account Type field, verify POP3 is displayed.In the E-mail Address field, enter your full AT&T email address e.g., If you are setting up this account for an AT&T Email Alias, input the alias email address in this field.Under Your Name field, type your name the way that you want it to appear to other people.Here are the steps to verify your email settings and a few more steps which may fix your issue.
Please verify your outlook settings again.
