On 07-22-2020 09:20:14, Mark Fletcher (markf@corp.groups.io) wrote:

It appears as of a couple hours ago, ATT started blocking us. This means
email to the following domains is not being delivered:
* att.net
* bellsouth.net
* pacbell.net
* prodigy.net
* sbcglobal.net
* flash.net
I'm trying to contact them.

Mark, Not surprising given all the other crap they pull. I've had problems with AT&T for years but ISP choices are non-existent.

In case you didn't know, AT&T farms out it's mail servers to Yahoo (at least on the west coast). If you have a contact for yahoo you could try there.

If you haven't already made contact, some customer tech support numbers are: 877-353-5963 (U-Verse), 888-341-1270 (DSL) & 888-341-1270 (general)

These, of course, are only tier one support (possibly to India), and you will have to escalate the call to get someone who actually knows what is going on and can do something about it. But hope is eternal!

One other option is their chat line which may be quicker (Chat button on bottom right):
https://www.att.com/support/topic/u-verse-high-speed-internet/topic_uverseinternetsuppor/

Namaste', Art