Email provider checker
Email provider lookup for any domain
What's actually handling the mail? Type a domain or email address and we'll check which service runs it, straight from public MX records: Google, Microsoft, Proton, Apple, and 160+ others.
Guide
How to find out who your email provider is
Every domain that can receive email advertises its mail servers in public DNS through MX (Mail Exchange) records. Reading those records tells you which email service provider a domain uses — no login or password required. Here is how to check it:
- Take the domain you want to look up — for an email address, that is everything after the
@. - Enter it in the checker at the top of this page and press Check.
- The tool resolves the domain's MX records over DNS and matches them against 160+ known providers.
- You get the provider name, its category — mailbox, gateway, forwarder, or relay — and the raw MX records as evidence.
If you would rather read the records than the verdict, the MX lookup shows the same result with the mail exchangers and their priorities up front.
Email security
How securely is it configured?
Knowing who runs a domain's mail is half the picture. These checks read the rest of its public DNS to show whether its email can be spoofed, and whether it can be delivered securely. Like the lookup above, they run in your browser.
- Email Security Report Runs every check at once and gives one verdict per standard, linking to the detail.
- MX Lookup Mail servers, priorities and addresses, with checks that each one can actually receive mail.
- SPF Checker Validates SPF syntax, counts DNS and void lookups across nested includes, and explains every term.
- DMARC Checker Validates DMARC against RFC 9989: tree-walk discovery, obsolete pct/rf/ri tags, t= testing, np= and report authorisation.
- MTA-STS Checker Checks the _mta-sts record, the HTTPS policy host and certificate, policy mode and max_age, and MX coverage.
- TLS-RPT Checker Validates the _smtp._tls record and its mailto: and https: report destinations.
- DANE Checker Checks DNSSEC validation for the domain and TLSA records at _25._tcp for every MX host.
- BIMI Checker Validates the default._bimi record and the DMARC enforcement BIMI requires.
- DKIM Checker Looks up DKIM keys by selector, or tries common ones, and checks key type, length and revocation.
- DNS Checker Checks nameserver count, addresses and network spread, SOA timers, and DNSSEC.
New to this? Start with SPF, DKIM and DMARC explained, or browse all email security guides.
FAQ
Checking email providers — common questions
How do I find out who my email provider is?
Enter your domain or email address — everything after the @ — in the checker at the top of this page. It reads the domain's public MX records over DNS and matches them against 160+ known services, so you instantly see whether Google Workspace, Microsoft 365, Proton, Fastmail, a security gateway, or something else is handling the mail.
How can I check the email service provider for any domain?
Type the domain into the form above and press Check. Every domain that receives email publishes MX (Mail Exchange) records in DNS, and this email provider checker resolves them and names the service behind them. It works for any domain, not just your own — handy for vetting a customer, vendor, or competitor.
Can I find my email provider without logging in anywhere?
Yes. The lookup uses only public DNS records, so you never sign in or share a password — you just need the domain name. That is also why it can identify the provider for a domain you don't control.
What is an email service provider?
An email service provider is the company that runs the mail servers for a domain, where messages are received and inboxes live. Common providers are Google Workspace and Microsoft 365 for business, and Gmail, Yahoo, iCloud, and Proton for personal mail. A domain can also route mail through a security gateway or forwarder that sits in front of the real provider.
Why does the checker sometimes show a gateway or forwarder instead of a mailbox?
Some domains point their MX records at a spam-filtering gateway (such as Proofpoint or Mimecast) or at a forwarding service rather than at the final mailbox. In those cases the MX records reveal the relay, and the real mailbox provider can be hidden behind it. The report labels this so you know exactly what you are looking at.