Is a Google Workspace address checked differently from a Gmail address?

Google's servers answer both the same way, so both get a full mailbox check. The difference is the domain: Workspace runs on the company's own domain, which can be set up as a catch-all, and Gmail can't.

Why does a Google Workspace address show as risky?

Most often because the admin routes unrecognised addresses to a shared mailbox, so Google accepts a made-up address too. It can also mean a gateway answered in front of Google, the address is a role inbox like info@, or the check got a temporary reply.

Does the person get an email or notification?

No. The checker disconnects after the RCPT TO step, before any message is sent, so nothing reaches the mailbox.

Can I check every address at a Google Workspace company?

One at a time here, five a minute. For a list, sign in with Google for 100 free email checks, no card; catch-all domains are flagged in the results.

Google Workspace email checker: does this company mailbox exist?

This Google Workspace email checker looks up the domain's MX record to confirm its mail runs on Google, then asks Google's server about the address at the RCPT TO step and disconnects before anything is sent. Workspace rejects addresses that don't exist with 550 5.1.1, so most answers are a clear valid or invalid, unless the admin routes unknown addresses elsewhere.

Google Workspace address

Tuned for company domains whose MX points at Google (aspmx.l.google.com and smtp.google.com). Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.

SimpleAPI

Sample result

jane@acme.example is invalid. Google says the account doesn't exist.

Email: jane@acme.example
Reason: Mailbox not found
Mail host (MX): Google Workspace

What this means for you

Workspace rejects unknown accounts clearly, unless the admin routes them elsewhere.

Next step:Verify a whole list

Confirms the domain's mail runs on Google
Asks Google about the mailbox
Tests a made-up address first
Notes when a gateway answers instead

Google Workspace
Company domains
No signup

By SimpleVerifier Team · Last updated October 22, 2026

How do I check if a Google Workspace email address exists?

Enter one company address, such as jane@acme.example. Gmail addresses belong in the Gmail checker.
Press Check. The domain's MX is looked up, and the Mail host line shows whether it points at Google.
The checker asks Google about a made-up address first, then the real one, and disconnects.
Valid means Google accepted the mailbox and rejected the made-up one. Invalid means it said the account doesn't exist. Risky means it couldn't be confirmed.

Example

You enter: An illustrative address at a domain whose MX points at Google: jane@acme.example.
You get: Mail host "Google Workspace" and a live verdict. Invalid with "Mailbox not found" when Google rejects the account (550 5.1.1); risky with "Accepts all addresses" when the admin routes unknown addresses to another mailbox. A gmail.com address is pointed to the Gmail checker.
Limits: Five checks a minute per IP address, one address at a time, no account needed.

How do I know if a company uses Google Workspace?

Look at its MX record. Workspace domains point their mail at Google's hosts, either the long-standing aspmx.l.google.com set or the single smtp.google.com record Google gives newer domains. The checker reads the MX for you and shows the provider on the Mail host line, and the Google Workspace MX records page lists the exact values Google asks domains to publish.

If a security gateway such as Proofpoint or Mimecast sits in front, the MX names the gateway instead. The checker then reads the SPF record: if it includes _spf.google.com, the mailboxes are most likely on Google behind the gateway. In that case the gateway, not Google, answers the mailbox check, and the result says so.

Can you verify a Google Workspace address without sending an email?

Usually, yes. Google's servers answer the RCPT TO question for Workspace domains the same way they do for Gmail, and Google documents the reply for a missing account in its Gmail SMTP errors and codes reference: 550 5.1.1 "The email account that you tried to reach does not exist". The checker stops at that point, so no message is delivered.

The exception is an admin setting. Workspace's Default routing lets an admin send mail for unrecognised addresses to another mailbox, which turns the domain into a catch-all. The checker tests a made-up address first, and if Google accepts it the result is risky with "Accepts all addresses" rather than a valid you can't trust.

What should I do with a risky Google Workspace result?

Read the reason. "Accepts all addresses" means the domain is catch-all, so every address there looks the same; send to it only if the address came from a good source, and watch for bounces. "Server would not confirm" or "Mailbox check unavailable" means the conversation was cut short, so try again later.

A Workspace account that was suspended or deleted bounces like any missing mailbox, so old B2B contacts often come back invalid: people leave and their accounts go. B2B contact data decay covers how fast that happens.

Who uses this tool, and for what?

B2B prospectors: Check a guessed address like firstname@acme.example at a company on Google before it goes into a sequence.
Recruiters: Confirm a hiring manager's address exists at a startup on Workspace, and see straight away when the domain accepts everything.
Ops and IT teams: Check that a new or renamed Workspace user answers from outside, or that a departed employee's address now bounces.

What can’t this tool tell you?

Domains whose admin routes unknown addresses elsewhere come back risky as catch-all; no single address can be confirmed there.
Behind a security gateway the gateway answers, not Google, and gateways often accept every address.
A Google group or alias accepts mail like a mailbox, so valid means the address receives mail, not that one person owns it.
One address at a time, five a minute.

Common questions

Is a Google Workspace address checked differently from a Gmail address?: Google's servers answer both the same way, so both get a full mailbox check. The difference is the domain: Workspace runs on the company's own domain, which can be set up as a catch-all, and Gmail can't.
What MX records does Google Workspace use?: Either the five-host set starting with aspmx.l.google.com, or the single smtp.google.com record Google gives newer domains. The Mail host line under the result shows which provider the domain's MX points at.
Why does a Google Workspace address show as risky?: Most often because the admin routes unrecognised addresses to a shared mailbox, so Google accepts a made-up address too. It can also mean a gateway answered in front of Google, the address is a role inbox like info@, or the check got a temporary reply.
Does the person get an email or notification?: No. The checker disconnects after the RCPT TO step, before any message is sent, so nothing reaches the mailbox.
Can I check every address at a Google Workspace company?: One at a time here, five a minute. For a list, sign in with Google for 100 free email checks, no card; catch-all domains are flagged in the results.

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

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One plan, 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.