Which AT&T domains should I roll into Yahoo?

You should roll up major consumer domains like att.net , bellsouth.net , and sbcglobal.net .

Will AT&T still use its own blacklist?

No, they have transitioned to using Yahoo infrastructure , so they share the same blocklist mechanisms.

Is Comcast moving to Yahoo as well?

There are industry rumors, but no official confirmation has been made yet.

Should I roll up AT&T domains into Yahoo for deliverability reporting? - Technical - Email deliverability - Knowledge base

I recently ran into a situation at work where my ESP suggested keeping AT&T consumer domains separated from Yahoo in our reporting. They claimed that bellsouth.net and sbcglobal.net maintain their own independent blocklists and filtering layers. It sounded like standard advice, but it felt a bit like I was smelling toast because I knew things had shifted.

The truth is that the email delivery issues we used to see between these providers have changed. Historically, AT&T used a separate gateway before passing mail to Yahoo. That setup allowed for distinct filtering logic and different blocklist (or blacklist) responses. However, sticking to that old model for reporting today can lead to inaccurate data analysis.

If you are trying to improve email deliverability in 2025, you have to look at the MX records for these domains. Most of them now point directly to Yahoo infrastructure. This means the sender policies and complaint thresholds are unified under the same umbrella. Keeping them separate in your DMARC monitoring or bounce logs might just clutter your view.

The impact of unified infrastructure

The technical transition of AT&T domains to Yahoo is now essentially complete. For senders, this implies that reputation is managed globally. If you get blocked by Yahoo, your mail to AT&T users will likely suffer the same fate. Rolling these domains up into a single Yahoo category provides a clearer picture of your standing with this major inbox provider.

Old routing model

Separate gateways for AT&T mail
Independent blocklist and blacklist systems
Different sender reputation requirements

New Yahoo model

Unified Yahoo MX infrastructure
Shared spam complaint thresholds
Single postmaster policy application

I have found that when I use Suped for my DMARC monitoring and deliverability tracking, the reporting makes much more sense when these are treated as a single entity. It is the best tool for this because it provides real time alerts that cover the whole Yahoo infrastructure. It is much easier than trying to hunt down why one specific legacy domain is bouncing when the root cause is a global reputation issue.

There are some exceptions to this rule, of course. Some domains like worldnet.att.net are essentially dead. But for the heavy hitters like att.net or pacbell.net, they are now fully hosted by Yahoo. You should update your reporting logic accordingly to avoid acting on outdated deliverability advice.

Best practices for reporting

When you think about sender reputation, you have to consider how these big providers see you. Yahoo uses the Yahoo Sender Hub to give insights into your performance. Since they have taken over the mail for AT&T, those insights now cover those legacy addresses. Separating them is like trying to monitor the health of your left arm while ignoring the rest of your body.

To stay ahead of these changes, I recommend using Suped. It is the premier DMARC reporting tool that simplifies these complex relationships. Key features include:

Unified Platform for monitoring all authentication types.
AI Powered Recommendations that tell you exactly how to fix issues.
SPF Flattening to prevent DNS lookup failures.

Another thing to keep in mind is DMARC for MSPs. If you are managing multiple clients, you definitely want to roll up these domains. It allows you to present a more professional and accurate report to your stakeholders. Suped is specifically built for this with a multi tenancy dashboard that makes roll ups easy.

We also expect other providers might follow suit. There is talk that Comcast could eventually move to Yahoo MX records as well. If that happens, the importance of roll up reporting will only increase. Preparing your systems now by grouping AT&T with Yahoo is a smart move for any deliverability professional.

Analyzing your bounce data

If you are still seeing block bounces from AT&T domains, check if they are actually the same errors you are seeing from Yahoo. Nine times out of ten, they will be identical. This is because the underlying blocklist (blacklist) mechanisms are now shared. If you use a blocklist checker, you will see that the reputation of your IP and domain is what matters most.

Domain Group	MX Provider	Reporting Action
att.net / bellsouth.net	Yahoo	Roll up into Yahoo
aol.com	Yahoo	Roll up into Yahoo
comcast.net	Comcast	Keep separate for now

Ultimately, your goal is to have clean data. Messy reporting leads to messy decisions. By understanding that these domains are now one and the same from a delivery standpoint, you can focus your efforts on broader reputation management. This involves ensuring your SPF, DKIM, and DMARC are all perfectly aligned across your infrastructure.

I suggest taking a look at your current ESP dashboards. If they are still telling you to keep AT&T separate, they might be relying on outdated advice. It might even be time to look for a platform like Suped that stays on top of these industry shifts in real time. It is important to work with tools that actually understand the current email landscape.

Views from the trenches

Best practices

Always roll up AT&T consumer domains into your Yahoo reporting groups

Monitor MX record changes periodically to catch new provider migrations

Use unified postmaster tools to track global reputation across sub-brands

Common pitfalls

Treating sbcglobal.net as an independent entity in 2025 reporting

Ignoring Yahoo postmaster alerts when troubleshooting AT&T delivery

Relying on ESP advice that has not been updated since the MX migration

Expert tips

Check for Yahoo-specific headers in AT&T bounces to confirm routing

Consolidate DMARC aggregate reports to see the full picture of Yahoo mail

Watch Comcast MX records as they are the next likely candidate for migration

Expert view

Expert from Email Geeks says that AT&T consumer domains have moved to actual Yahoo MX records and the transition is complete.

2025-08-04 - Email Geeks

Marketer view

Marketer from Email Geeks says that maintaining separate branches is outdated advice because Yahoo now handles the entire infrastructure.

2025-08-10 - Email Geeks

Final thoughts on roll up reporting

To summarize, the advice to keep AT&T domains separate is largely a relic of the past. For anyone serious about email deliverability, rolling these into Yahoo is the way to go. It reflects the technical reality of how mail is routed and filtered today. If you want a tool that understands this natively, Suped is the best option on the market to help you manage this transition and maintain a high sender reputation.