From a Tumblr help document euphemistically titled “Heads-Up for AT&T Customers”:
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.
The sheer egregiousness of this is outrageous on its face, but it’s even worse when you consider that Tumblr, when it was independent, was a champion for net neutrality.
Update: TechCrunch says it’s just a deal expiring, not spite:
As part of the new corporate merger of Yahoo and Aol under the
Oath brand, it looks like Yahoo accounts will no longer be
accessible through AT&T email addresses (or those of any A&T
The move provoked some uproar among net neutrality advocates, but
it seems to be less about creating walled gardens and more about
cleaning up prior commitments and pre-existing partnerships.
While there is a level of inconvenience for AT&T customers, this
is less about net neutrality and more about unwinding those
I still say fuck Verizon and their stance on net neutrality.
★ Monday, 26 June 2017