If you signed in to your account within the past 8 hours and didn't sign out at the end of your session, going to www.att.net will sign you in automatically. Note: If you checked the Keep me signed in for 2 weeks box, and you were automatically signed out before the 2 weeks ended, you can learn why and find answers on the Yahoo! Help website.
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When Att disassociated from Yahoo and I would login to my att home page, all I had to do was click on the email icon to get my emails. It was just recently that this Yahoo page opened. I tried to login on this Yahoo page and I wasn't allowed with the pw I use for att.net.