MX lookup

Check a domain’s current MX records and read mail exchangers in priority order.

How to read MX records

Each record names a mail exchanger and a preference value. Lower values are preferred. Equal values let senders choose between exchangers at the same priority.

No MX answer is different from a null MX record. A null MX explicitly says the domain does not accept email; an empty MX answer may still use address-record fallback. The null MX versus no MX guide explains that boundary.

DNS data is resolved through Cloudflare’s public DNS-over-HTTPS service. This lookup does not contact a mailbox.

Other free email tools

SPF checkerRead a domain’s sender authorization record.DMARC checkerInspect policy, alignment, and reporting tags.Disposable email checkerCheck an address against known temporary providers.

Check the complete address in your product.

Use one server-side request to evaluate format, domain, provider, and mailbox evidence before accepting a signup.

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