How can I tell which email provider a domain uses?

Enter the domain and this tool analyzes its MX records to name the email provider — such as Google Workspace or Microsoft 365 — with a confidence score.

How does the email provider detector work?

Every domain that receives email publishes MX records pointing at its mail servers. The detector looks up these records live and matches the server hostnames against known providers like Google, Microsoft, Zoho and ProtonMail.

Can it detect self-hosted mail servers?

Yes, partially. If the MX records point at the domain own server or an unrecognized host, the tool reports that the mail appears self-hosted or uses an unknown provider, and shows the raw MX records.

Does it work for domains with multiple MX records?

Yes. Most domains publish several MX records with priorities for redundancy. The tool analyzes all of them and identifies the provider from the highest-priority records.

Why does it show an email security gateway?

Some domains route mail through filtering services like Proofpoint or Mimecast before delivery. The tool identifies these gateways and explains that the final mailbox provider sits behind them.

Yes. MX records are public DNS records by design, since every mail server on the internet needs them to deliver mail. Looking them up is standard practice.

DNS & NETWORK TOOLS · FREE ONLINE TOOL

Email Provider Detector

Find out which email service a domain usesA company's email provider is written into its DNS, visible to anyone who knows where to look. This detector reads a domain's MX records and names the provider behind it in seconds.

✓ Free to use✓ No sign-up✓ Ready in your browser

// EMAIL PROVIDER DETECTOR · GET STARTED

Use Email Provider Detector

Find out which email service a domain uses

// EMAIL PROVIDER DETECTOR · HOW IT WORKS

How to use the Email Provider Detector

Enter domain

Enter the domain (e.g. example.com).

Look up MX records

Click "Detect provider" to look up its MX records.

See the provider

See the identified email provider with evidence.

// EMAIL PROVIDER DETECTOR · ABOUT THIS TOOL

About the Email Provider Detector

A domain's email provider is no secret: MX records are public DNS entries. This detector queries them live and matches the mail server hostnames against a database of known providers, from Google Workspace and Microsoft 365 to Zoho and ProtonMail.

Useful for sales research, competitive analysis, and deliverability checks. When the records are unfamiliar, the tool shows the raw MX data instead of guessing.

Where it helps most

Sales, security and migration work.

Sales qualification

Teams check whether a prospect is on Google Workspace or Microsoft 365 before a call, because the pitch differs.

Migration planning

Consultants document the current mail setup at the start of every project before planning the move.

Security profiling

Researchers note the provider as part of the mail infrastructure picture; phishing investigators compare it against what a suspicious email claims.

Competitive tracking

Watch when a rival switches providers, which often signals a broader IT overhaul underway.

What you get

Beyond the provider name.

Ranked MX records

The tool resolves the live MX records and ranks them by priority, highest first.

Provider fingerprints

Hostnames are matched against known patterns, from Google Workspace and Microsoft 365 to Zoho, Proton and Fastmail.

Hybrid setups

The raw view reveals hybrid routing, like Microsoft 365 for staff mail plus a transactional service, or a security gateway in front.

Email Provider Detector: built for trust

Public MX records, queried live. Nothing installed, no signup needed.

// EMAIL PROVIDER DETECTOR · COMMON QUESTIONS

Email Provider Detector FAQs

How can I find out which email provider a company uses?

Check the domain's MX records. Enter the domain here and the tool identifies the provider, such as Google Workspace or Microsoft 365, from those records automatically.

Can a domain use more than one email provider?

What does it mean if the MX points to a security gateway?

Is detecting someone's email provider legal?

tools-guide

Hosting Provider Checker: Who Hosts Any Website

Free hosting provider checker. Reveal any website's hosting company accurately, server IP and reverse DNS from header and DNS fingerprints, in seconds.

Read article →