Starting on June 30, 2017, att.net customers will no longer be able to log in to their Yahoo and Tumblr accounts through email addresses with the following domains: att.net, ameritech.net, bellsouth.net, flash.net, nvbell.net, pacbell.net, prodigy.net, sbcglobal.net, snet.net, swbell.net, and wans.net.
