AT&T email checker: att.net, sbcglobal.net and bellsouth.net
In short: Checks att.net and the legacy AT&T domains (sbcglobal.net, bellsouth.net, pacbell.net and more) for syntax, typo domains, mail servers and disposable or role use, and says plainly that AT&T's Yahoo-run servers won't confirm a mailbox. Limit: It does not confirm that an AT&T mailbox exists. Well-formed AT&T addresses come back risky.
This AT&T email checker tests an att.net, sbcglobal.net, bellsouth.net or other AT&T address for broken syntax, typo domains, a missing mail server and disposable or role use, without sending anything. It can't confirm the mailbox: AT&T mail is received by Yahoo-run servers, which accepted made-up addresses in our checks, so a well-formed address comes back risky, never valid.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. See pricing
Tuned for att.net, sbcglobal.net, bellsouth.net, pacbell.net, swbell.net, prodigy.net. Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
What can a check confirm at AT&T Mail, and what did we measure there? Can you verify an AT&T Mail address?
Sample result
name@sbcglobal.net passes every check that can run, but AT&T's servers accept any address.
- name@sbcglobal.net
- Reason
- Accepts all addresses
- Mailbox check
- SMTP, nothing sent
What this means for you
Risky means unconfirmed, not bad; let the address's source decide.
- Catches typo domains with no mail server
- Flags disposable and role addresses
- Says when AT&T accepts every address
- Covers att.net, sbcglobal.net and bellsouth.net
- AT&T
- sbcglobal.net
- bellsouth.net
By SimpleVerifier Team · Last updated
Also in: Español
How do I check an AT&T email address?
- Type or paste one address, such as
name@att.net,name@sbcglobal.netorname@bellsouth.net. - Press Check. Syntax, domain, mail server, disposable and role checks run, then the tool asks AT&T's mail server about a random address that can't exist, and about yours, and disconnects before anything is sent.
- Read the verdict. Invalid means the address can't receive mail. Risky with "Accepts all addresses" means the server said yes to the made-up address too, so its yes to yours proves nothing.
- Decide risky AT&T addresses by where they came from and when they last engaged; send an old segment a small first batch.
Example
- You enter
- One address:
name@sbcglobal.net. - You get
- Risky, with the reason "Accepts all addresses": syntax, domain, disposable and role checks passed, and AT&T's Yahoo-run server (mx-att.mail.am0.yahoodns.net) accepted a random address that cannot exist as well as this one. Broken syntax, a dead domain or a disposable domain comes back invalid.
- Limits
- Five checks a minute per IP address, one address at a time, no account needed.
Can you check if an AT&T email address exists?
Not with certainty, and this checker doesn't pretend to. On 4 November 2026 att.net, sbcglobal.net, bellsouth.net and the other AT&T domains all published one MX host, mx-att.mail.am0.yahoodns.net, on the Yahoo-run network that also receives yahoo.com mail. In our verification study on 23 October 2026 that server accepted made-up att.net and sbcglobal.net addresses in both rounds, and a fresh made-up att.net address was accepted again on 4 November.
Real and fake addresses get the same yes, so SimpleVerifier returns them as risky with the reason "Accepts all addresses". What the checker still catches is what breaks most rows: a mistyped address, a typo domain, a throwaway domain or a shared role inbox. The AT&T provider page has the live DNS and AT&T's own rules.
Which domains are AT&T email addresses?
AT&T's help page says AT&T email addresses may end in @ameritech.net, @att.net, @bellsouth.net, @currently.com, @flash.net, @nvbell.net, @pacbell.net, @prodigy.net, @sbcglobal.net, @snet.net, @swbell.net and @wans.net. This checker is tuned for all of them, and treats them as one provider.
AT&T sells its paid mail tier as a partnership with Yahoo, which fits the yahoodns.net servers these domains publish. That is why the Yahoo email checker and this one give the same kind of answer.
Why do old AT&T addresses need extra care?
AT&T's mail help says a mailbox not used for 12 months is considered inactive and its contents are deleted, and that an inactive mailbox can be recovered for up to three years by signing in. An AT&T address can go quiet and come back, so neither an old bounce nor an old open is the last word.
Because no checking server can confirm these mailboxes, recency is the signal to trust. To check a whole list, sign in and use the bulk verifier: AT&T rows land in risky with the reason shown, separate from rows that were confirmed. For Comcast, the other big US internet provider domain, see the Comcast email checker.
What can this checker confirm at AT&T?
Each row is something the check runs on an AT&T address, and the result you can get from it.
| Check | Can we confirm it? | Result when it fails |
|---|---|---|
| Syntax (the address is written correctly) | Yes | Invalid |
| Domain and mail server (MX) | Yes | Invalid, with a typo suggestion where one fits |
| Disposable or role address | Yes | Invalid (disposable) or risky (role) |
| The mailbox exists | No: AT&T's Yahoo-run server accepts made-up addresses | Risky, "Accepts all addresses", never valid |
| The mailbox is still active | No checker can | Use recent opens, replies or a small first send |
Mailbox behaviour as measured in our verification study on 23 October 2026 and checked again on 4 November 2026.
Who uses this tool, and for what?
- Local businesses with older customer lists
- Separate broken sbcglobal.net and bellsouth.net rows from the ones that are only unconfirmed before a send.
- Support teams
- Catch a mistyped att.net address, or a typo domain like att.nt, before you reply to it.
- Anyone comparing verifiers
- See why one tool calls an AT&T address valid and another risky: a server that accepts every address can't confirm any one of them.
What can’t this tool tell you?
- It does not confirm that an AT&T mailbox exists. Well-formed AT&T addresses come back risky.
- It can't tell whether a mailbox has gone inactive under AT&T's 12-month rule.
- AT&T doesn't publish how its servers answer mailbox checks; the handling here is from our own measured checks, which can change.
- One address at a time, five a minute.
Common questions
- How do I check if an att.net email address is valid?
- This checker confirms the syntax, the mail servers and whether the address is disposable or a role inbox. It can't confirm the mailbox: AT&T's Yahoo-run server accepted made-up addresses in our checks, so a well-formed att.net address comes back risky, never valid.
- Is sbcglobal.net still an AT&T email address?
- Yes. AT&T's help lists sbcglobal.net among the domains an AT&T email address may end in, with att.net, bellsouth.net, pacbell.net, swbell.net, prodigy.net and others. On 4 November 2026 they all used the same mail server.
- Is AT&T email run by Yahoo?
- AT&T Mail's receiving servers are on Yahoo's network: att.net's MX is mx-att.mail.am0.yahoodns.net, and AT&T describes its paid tier as a partnership with Yahoo.
- Does AT&T delete inactive email accounts?
- AT&T's help says a mailbox not used for 12 months is considered inactive and its contents are deleted. It can be recovered for up to three years by signing in.
- Is the AT&T checker free?
- Yes, five checks a minute with no account. For a whole list, sign in with Google for 100 free email checks, no card, or use a paid plan.
Sources
That was one address. Most people have a list.
The free checker does five addresses a minute, one at a time — fine for spot-checking, useless for a CSV of 40,000.
- Upload a CSV up to 100,000 rows
- Valid, risky and invalid exported as separate files
- Repeat checks free for 14 days, no new connections
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.