Can send but cannot receive emails
I have an att.net email address that I have not regularly used in the last year. I verified I can send emails but it will not allow incoming emails. I have tried sending/receiving to several different email addresses, I have used old and brand new devices. The error comes back to the sender as a Failure Notice..<email address> 550:5.2.1 <email address>... blank mailhost.
How do i fix?