Without proper ATT server settings, you cannot access your mails in any device. To get the right ATT email server setting, (for POP3 accounts) you need to enter inbound.att.net for the incoming mail server and outbound.att.net for the outgoing mail server. (For IMAP accounts), you need to enter imap.mail.att.net for the Incoming mail server, and smtp.mail.att.net for the Outgoing mail server. If any issue arises, feel free to contact ATT techies. You can use toll free helpline number for instant communication. They always give prompt responses. They are active for 24x7 hours. They always maintain service quality. They always maintain the deadline too.