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MX Record Lookup

Look up the MX (Mail Exchange) records for any domain to see which mail servers handle its email.

Frequently Asked Questions

Common questions about the MX Record Lookup tool.

MX (Mail Exchange) records tell sending mail servers where to deliver email for a domain. A domain can have multiple MX records with different priority values; the lowest priority number is tried first.

Lower = higher priority. A mail server tries the lowest-priority host first, then falls back to the next one if it's unreachable. Typical setup: primary MX at priority 10, backup at 20.

Yes — in which case RFC 5321 says to fall back to the domain's A record. Most properly-configured domains have explicit MX records; relying on the A-record fallback is fragile.

Check: (1) TTL may not have expired on the old records yet, (2) your mail server must accept mail FOR your domain (not just relay), (3) SPF/DKIM must be configured for outbound, (4) PTR must be set on the sending IP.

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