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Free MX Record Lookup

Enter any domain to retrieve its MX records, sorted by priority, with automatic detection of the email provider — Google Workspace, Microsoft 365, Zoho, and 15+ others.

What MX records tell you

MX (Mail Exchanger) records tell the internet which servers are responsible for accepting email for a domain. Each record has a priority value — the lower the number, the higher the preference. When sending email, other servers try the lowest-priority MX first, failing over to higher-priority entries if the primary is unavailable.

Provider detection works by matching MX hostnames against known patterns. Google Workspace MX records always route through aspmx.l.google.com and variants; Microsoft 365 uses *.protection.outlook.com; and so on.

Why it matters

  • Deliverability research — knowing a recipient's email provider helps you diagnose delivery issues or apply provider-specific best practices.
  • Sales intelligence — identify which email platform a prospect uses before your outreach.
  • Migration verification — confirm that MX records have been updated correctly after switching email providers.

Usage limits

10 lookups per minute per IP. No account required. Results are live — not cached.

Need bulk MX lookups and provider detection via API checks?

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FAQ

Priority is a number (typically 0–100). Lower numbers mean higher preference — the sending server will try the lowest-priority MX record first. Multiple records with the same priority are tried in random order (load balancing).

Multiple MX records provide redundancy. If the primary mail server is down, email falls over to the next in priority order. Some providers use many entries for load distribution.

Some domains fall back to the A record for mail delivery (RFC 5321), but most modern domains without MX records simply do not accept email. Sending to such domains usually results in a bounce.

Yes — enter the full subdomain (e.g. mail.example.com). MX records can be set at any DNS label.
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