How to Check if a Google Workspace (Company Gmail) Address Exists
To check a Google Workspace address, confirm the domain's mail runs on Google, then ask Google's server about the address and stop before sending. The Google Workspace email checker does both: it reads the domain's MX record, asks Google about a made-up address and then yours at the RCPT TO step, and disconnects. Google rejects unknown accounts with 550 5.1.1, so the answer is usually a clear valid or invalid.
The catch is the domain. A company can switch on a catch-all, and then no single address can be confirmed.
Step 1: confirm the domain runs on Google
Look at the MX record. Google Workspace domains point at aspmx.l.google.com and its four siblings, or at the single smtp.google.com record given to newer domains. If the MX points somewhere else, a security gateway or another provider is in front, and the rules change. See verifying emails behind security gateways.
Step 2: ask the server by hand, or use the tool
By hand you open port 25 to the MX host, send MAIL FROM, then RCPT TO for the address, and read the reply: 250 means accepted, 550 5.1.1 means the account does not exist. Always try a made-up address at the same domain first. Most connections block port 25, so the easier route is to paste one company address into the Google Workspace email checker. It is free, five checks a minute, no account. Gmail addresses belong in the Gmail address checker; the code table is in how to check if a Gmail address exists.
Step 3: read the result
| Result | Reason | What it means |
|---|---|---|
| Valid | Mailbox exists | Google accepted the address and rejected the made-up one |
| Invalid | Mailbox not found | Google said the account does not exist |
| Risky | Accepts all addresses | The admin accepts unknown addresses, so a yes proves nothing |
| Risky | Role-based address | A shared inbox such as sales@ |
The made-up address is what makes valid trustworthy. If Google would accept that too, the real address cannot be confirmed. Read more in what is a catch-all domain and Google Workspace catch-all verification.
Same Google servers, different domain
Google answers Workspace and Gmail mailbox checks the same way. The difference is that Workspace runs on the company's own domain, which an administrator can set up as a catch-all. Gmail itself cannot.
What this check cannot do
- On a catch-all domain no single address can be confirmed.
- Behind a gateway the gateway answers, not Google, and gateways often accept every address.
- A group or alias looks like a mailbox, so valid is not proof that one person owns it.
- It cannot say whether the person still works there. See valid email but the person left the company.
If you have a list of company addresses
Upload it on the verify page: the first 100 email checks are free with a Google sign-in, no card. Each address comes back valid, risky or invalid with a reason, and catch-all domains are flagged. For larger lists see bulk email verification and pricing.
Check a company address now
Paste it into the Google Workspace email checker.
Common questions
Can you check if a Google Workspace email exists?
Usually yes. Google's servers reject an address that does not exist with 550 5.1.1 at the RCPT TO step and accept one that does, so most answers are a clear valid or invalid. The exception is a domain whose admin routes unknown addresses to a shared mailbox.
How do I know a company uses Google Workspace?
Look up the domain's MX record. Google domains use either the five-host set starting with aspmx.l.google.com or the single smtp.google.com record Google gives newer domains. The checker's Mail host line shows it.
Why is a Google Workspace address risky?
Most often because the admin accepts mail for unrecognised addresses, so Google accepts a made-up address too and the result is 'Accepts all addresses'. It can also mean a security gateway answered in front of Google, or the address is a role inbox such as info@.
Does the person get a notification?
No. The check disconnects after the RCPT TO step, before any message is sent.
Does valid mean one person owns the address?
No. A Google group or alias accepts mail like a mailbox, so valid means the address receives mail, not that a single person reads it.
Check your list before you send
Real mailbox checks over SMTP, and nothing is sent to the address. Sign in with Google and your first 100 email checks are free, no card. Plans for bigger lists are on the pricing page.