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Email using Uverse

How do I resolve this Outlook 2010 email error message?

This Certificate has expired or is not yet valid.
Issued to: outbound.att.net
Issued by: VerSign Class 3 Secure Server CA-G3
Valid from: 9/9/2012 to 10/1/2013

looks like someone forgot to re-up... try smtp.att.yahoo.com as outgoing... that might still be working