There are multiple slack threads in various deliverability channels.
AT&T/Yahoo is aware but no ETA on fix.

On Thu, Feb 20, 2025 at 12:45 PM Dave Dewey via mailop <[email protected]>
wrote:

> Quoting Rob McEwen via mailop ([email protected]):
>
> > Starting earlier today (Feb-20-2025) AT&T/Prodogy/Yahoo started
> > rejection my users' emails due to my sending-IP-address
> > (204.9.77.40) allegedly not having rDNS, except it does! This is
> > happening to emails sent to the email addresses hosted at the
> > following domain names:
> >
> > prodigy.net
> > bellsouth.net
> > att.net
>
>
> Same here, and including sbcglobal. Just started a short while ago.
>
> I also don't see any issues with reverse dns on my side, testing from
> multiple locations.
>
> I emailed [email protected]... not sure if that's attended any
> longer.
>
> Assuming something broke over there...
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