Bulk Google Workspace and Microsoft 365 email finder: which addresses are at companies on each?
In short: Paste email addresses and split company domains on Google Workspace and Microsoft 365 from personal Gmail and Outlook.com ones, from MX records. Limit: Reads where a domain's mail is hosted, never whether a mailbox exists.
A bulk Google Workspace and Microsoft 365 email finder reads each address's domain and shows which companies host their mail on Google Workspace or Microsoft 365, kept apart from personal Gmail and Outlook.com addresses that use the same servers. Paste up to 100 domains a run, or 500 after a free Google sign-in. It checks the domain, not the mailbox. CSV download.
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. Check your list free nowSee pricing
Sample result
acme.example's mail is hosted by Google Workspace; sam@gmail.com is personal Gmail.
- Address
- jane@acme.example
- Domain
- acme.example
- MX host
- aspmx.l.google.com
What this means for you
The provider says where mail is hosted, not whether a person's mailbox exists.
- Company domains apart from Gmail and Outlook.com
- Gateways read through SPF
- One row per address
- CSV out, nothing emailed
- Workspace
- Microsoft 365
- MX
By SimpleVerifier Team · Last updated
Got a list you want to split by mail provider?
- Paste it above to see which addresses are at Google Workspace and Microsoft 365 companies, with a CSV.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I find which email addresses are on Google Workspace or Microsoft 365?
- Paste email addresses, one per line, or upload a CSV. Addresses are found anywhere in the text.
- Press Find Workspace and 365 addresses. Only the unique domains are sent, 100 a request, and each gets an MX and a TXT lookup. No mail is sent.
- Read each row: Google Workspace, Microsoft 365, Gmail (personal), Outlook.com (personal), Other provider, No mail server or Lookup failed.
- Filter to one provider and download the CSV.
Example
- You enter
- Four addresses:
jane@acme.example(company on Google Workspace),tom@globex.example(company on Microsoft 365),sam@gmail.comandkim@outlook.com. - You get
- jane: Google Workspace. tom: Microsoft 365. sam: Gmail (personal). kim: Outlook.com (personal). Each row shows the provider and whether a gateway sits in front. Download the CSV.
- Limits
- Up to 100 unique domains a run without an account and 500 when signed in with Google. 100 domains a request; MX and TXT lookups only.
How does it tell a company on Google Workspace from Gmail?
Google Workspace and personal Gmail share MX hosts, so the host alone doesn't separate them. This tool reads the domain too: gmail.com and googlemail.com are personal, and any other domain whose MX points at Google is a company on Workspace. Microsoft 365 is split the same way from Outlook.com, Hotmail and Live.
The provider table is the one the bulk email provider lookup uses.
What about companies behind a security gateway?
Some companies route mail through a gateway such as Proofpoint or Mimecast, so the MX host names the gateway. When the SPF record names exactly one of Google and Microsoft, the row is placed with that provider and marked as behind a gateway; if it names both or neither, it shows as Other provider. See the secure email gateway checker for the gateway view.
What does the provider tell me, and what doesn't it?
It says where a domain's mail is hosted. It does not say whether a person's mailbox exists, and Google Workspace and Microsoft 365 hide that from simple lookups. To check mailboxes, the hand-off below runs the list through the mailbox check.
For single addresses, see how to check if a Google Workspace email exists and whether a domain uses Microsoft 365.
Who uses this tool, and for what?
- Sales teams
- Segment a list by the mail platform a company uses before tailoring a pitch.
- Deliverability consultants
- Split a send by Google and Microsoft to read results per provider.
- Agencies
- Count how many list rows are Workspace and 365 companies.
- IT resellers
- Find companies on a platform they sell services for.
What can’t this tool tell you?
- Reads where a domain's mail is hosted, never whether a mailbox exists.
- Behind a gateway the SPF record decides, and only when it names exactly one of Google and Microsoft.
- A domain can be migrated since its DNS was cached; run again for fresh results.
- Up to 100 domains a run without an account, 500 signed in.
Common questions
- How do I find Google Workspace emails in a list?
- Paste the list into a bulk Google Workspace and Microsoft 365 email finder like this one. Each domain's MX records show whether it is a company on Workspace or personal Gmail.
- Is this bulk email finder free?
- Yes. It is a free tool: up to 100 domains a run with no account, and up to 500 a run when you sign in with Google, with no card.
- Does it tell me whether the mailbox exists?
- No. It checks the domain, not the mailbox. It says where mail is hosted, not whether a person's address works.
- Why are Gmail and Outlook.com listed separately?
- They use the same servers as Workspace and Microsoft 365 but are personal addresses, so mixing them in would overcount company mailboxes.
- What does behind a gateway mean?
- The MX record names a security gateway, and the mailbox provider is read from the SPF record instead.
- Does it send an email to test?
- No. It reads MX and TXT records only.
Sources
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
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.