MX Lookup
Enter a domain to see its mail servers, ordered by priority.
Overview
MX (Mail Exchange) records tell the internet which mail servers are responsible for accepting email on a domain's behalf, each with a priority value — lower numbers are tried first. This tool queries a domain's MX records directly and lists them in priority order, which is the quickest way to confirm where a domain's email is actually routed.
Examples
A domain with two mail servers
example.com
10 mail.example.com 20 backup-mail.example.com
How It Works
- Enter a domain name, e.g. example.com.
- Click Look Up to query its MX records.
- Review the mail servers listed, in priority order (lowest number first).
Use Cases
Confirming an email provider migration
Check that MX records point to the new provider after switching email hosts.
Diagnosing undelivered mail
Confirm a domain actually has MX records configured before assuming a delivery issue is elsewhere.
Tips
- A domain with no MX records can't receive email at all, even if it has a working website.
- Some domains intentionally have no MX records because they never send or receive email — that's not necessarily a misconfiguration.
FAQ
It's the priority value — lower numbers are tried first. A sending server attempts the lowest-priority server first and falls back to higher numbers if it's unreachable.
Some providers send outbound mail from a different domain or subdomain than the one that receives it — check the specific domain used in the sender's email address.