MX Lookup
Find a domain's mail servers, check that they resolve, and see SPF & DMARC status.
Free • no sign-up • results run live in your browser via public DNS resolvers.
What does an MX lookup show?
MX (Mail Exchange) records tell the world which servers accept email for a domain. Each MX record has a priority — lower numbers are tried first. This tool lists every MX record in priority order, resolves each mail server to its IP address to confirm it works, and checks whether the domain publishes SPF and DMARC records.
Reading the results
- Priority — the order mail servers are tried (lowest first).
- Resolves to — the IP each mail server points to. A missing IP means inbound mail may bounce.
- SPF / DMARC — email-authentication records that protect against spoofing.
Frequently asked questions
At least two MX records pointing to mail servers that resolve to valid IPs, plus SPF and DMARC records for authentication. For full email-auth analysis use our Email Security Checker.
If you don't host email on the domain, that's fine. If you expect to receive mail, add MX records pointing to your mail provider's servers.
Sending servers try the lowest-priority (smallest number) MX first, falling back to higher numbers if it's unavailable. Equal priorities are load-balanced.