inbound.att.net is not responding.

Did it work previously?

Is this a new problem?

Have you re-checked your settings?

Relaunched macmail?

The same thing happens with outlook and thunderbird. There is another thread for this same problem. Call India and all they will say is that the server is Ok and then want to charge you to look into it. Its my understanding that I have to use this to get to ATT/YAHOO. The last time I called in I was told that the incoming server should be att,net. ATT nor India doesn't know whats going on nor will they admit to a problem.

Sorry I don't know what's going on.  I see other threads too with similar problems.  I just sent a test message to myself (I use Thunderbird) with no problems so I think the servers are up but maybe choking on certain accounts for some unknown reason.  well other than them being yahoo servers of course!

Long shot - might try calling the Digital Assistance Center (877-267-2988).

The Digital Assistance Center (877-267-2988) told me that the incoming server had to be set to att.net which is clearly wrong. Course if I pay they will look into it.

Any way to get someone in management to realize ATT has a problem?

Worked for last 3 days. Today 3/5/18 its back to same old crap - times out.

down again

Likewise, using Thunderbird, VPN turned off, 8,000 messages waiting to be downloaded locally. 

I find the problem mostly occurs when I have a lot of messages in my in box.

PS, Inbound.att.net responds to pings.  (Don't use the "is web site down" web sites to check.)