MX records lookup
MX records, short for Mail Exchanger records, are the DNS entries that tell senders where to deliver email for a domain. When your mail server has a message for `someone@example.com`, it queries DNS for the MX records of `example.com` and sends the message to the highest-priority server in the list. If MX is misconfigured, missing, or pointing at the wrong host, inbound mail bounces or gets routed incorrectly. This tool fetches the MX records for any domain over DNS-over-HTTPS, sorted by priority. A lower priority number means higher precedence. Many domains list multiple MX records for redundancy, and email systems retry against each in priority order before giving up.
Frequently asked questions
It's the order in which sending mail servers should try the recipient mail servers. Lower numbers go first. Identical priorities are tried in random order so you can load-balance.
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