Here is an update in SBC Global if you have specific type of email on your device you have to change your set. here is a quick guide how you can update your sbc global mail setting on your device
Device & operating system (OS)
1. iPhones & iPads running iOS 9.0 and above
Apple Mail
Outlook Mobile
Yahoo Mail app
2. Android devices
Gmail
Outlook Mobile
Yahoo Mail app
Select your device
setup sbcglobal email on iPhone
Set up sbcglobal email on outlook
When you configure your account, use these server settings:
IMAP
Inbound server - imap.mail.att.net (Port 993)
Outbound server - SMTP.mail.att.net (Port 465)
POP3
Inbound - server hostname: inbound.att.net (Port 993)
Outbound -server hostname: outbound.att.net (Port 465)
Get AT&T email from basic phones
If you have a basic phone, you don’t have to worry about a secure mail key. You’ll access your AT&T email from the Web.
Go to currently.com.
Select the mail icon.
Enter your sign-in info. If you save your password, you can access your email when you select the mail icon.