Fixed - AT&T are no longer blocking mail forwarded from our US MX servers. (16:29 UTC — Nov 14)
Watching - AT&T says that our US MX servers will be unblocked in 24-48 hours. (22:01 UTC — Nov 13)
At this time AT&T is blocking mail forwarded from our US MX servers. We’re working with AT&T to resolve the problem. (19:01 UTC — Nov 13)