I'm betting more likely Yahoo (https://downdetector.com/status/yahoo-mail),
as Yahoo does handle/frontend some of AT&T's email.

Frank

-----Original Message-----
From: mailop [mailto:[email protected]] On Behalf Of Jay Hennigan
Sent: Tuesday, November 10, 2015 4:39 PM
To: [email protected]
Subject: Re: [mailop] Delivery issues to sbcglobal.net

On 11/10/15 10:58 AM, Frank Bulk wrote:
> We're seeing delivery issues to sbcglobal.net since 9 am U.S. Central.
>
> Two log items are:
>       Open (144.160.159.21) Error 9sec (399 TCP Read failed (Connection
> refused after 0 seconds) 0 sec)
>       Site sbcglobal.net (144.160.159.21) said in response to MAIL FROM
> (451 4.1.8 Client IP address 96.31.0.20 does not resolve.flph400.Fix
reverse
> DNS.For more information email [email protected])
>
> And yes, 96.31.0.20 does have a PTR. =)

Could be related to AT&T outage.

https://downdetector.com/status/att/map

--
Jay Hennigan - CCIE #7880 - Network Engineering - [email protected]
Impulse Internet Service  -  http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV

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