Which of My Leads Use Google Workspace or Microsoft 365?

To find which leads use Google Workspace or Microsoft 365, read each address's domain and look at where its MX records point. The bulk Google Workspace and Microsoft 365 email finder does it for a pasted list, 100 domains a run (500 after a free Google sign-in), and keeps company domains apart from personal Gmail and Outlook.com addresses.

It checks the domain, not the mailbox. It tells you where mail is hosted, not whether a person's address works.

This post is about a list. For one company, see how to tell if a company uses Google Workspace or Microsoft 365.

The by-hand way

Look up the domain's MX records with the MX lookup. A host on google.com or smtp.goog points to Google, and one on mail.protection.outlook.com points to Microsoft 365. The catch is that personal Gmail and Outlook.com use the same servers, so the host alone cannot separate a company from a person. You have to read the domain too.

Step 1: paste the addresses

Paste addresses one per line, or upload a CSV. Addresses are found anywhere in the text.

Step 2: run the check

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.

Step 3: read the result

Result	What it means
Google Workspace	A company domain with MX at Google
Microsoft 365	A company domain with MX at Microsoft
Gmail (personal)	gmail.com or googlemail.com
Outlook.com (personal)	Outlook.com, Hotmail or Live
Other provider	Mail is hosted elsewhere
No mail server	The domain takes no mail
Lookup failed	Run it again

Filter to one provider and download the CSV.

What about 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. The secure email gateway checker gives the gateway view.

What this check cannot do

• It says where a domain's mail is hosted. Workspace and Microsoft 365 hide whether a mailbox exists from simple lookups.
• A domain may have been migrated since its DNS was cached. Run again for fresh results.
• Behind a gateway the SPF record decides, and only when it names exactly one of the two.
• The limit is 100 domains a run without an account and 500 signed in.

For single addresses, see checking if a Google Workspace email exists and whether a domain uses Microsoft 365. To split a send by provider, read Google Workspace vs Microsoft 365 for cold email.

Before you send

Knowing the platform does not tell you which people still have a mailbox. Run it through the verify page and the first 100 checks are free once you sign in with Google. You will see valid, risky or invalid for each address, with a reason, and your contacts receive nothing. Pricing and list cleaning explain what happens beyond that.

Split your list now

Paste it into the bulk Google Workspace and Microsoft 365 email finder.