MX records route inbound email
MX records name the mail exchangers for a domain. Lower preference numbers are tried first; multiple records can provide alternate routes.
← All public tools
Free public checker
MX lookup
Resolve mail exchange records, addresses and null-MX configuration.
Your result will appear here.
Run the check to see structured findings, severity, evidence and next steps from the public diagnostics API.
The details
MX records route inbound email
A null MX is explicit
A null MX record (preference zero with a dot target) signals that a domain does not accept email. Missing MX records can behave differently depending on other DNS records.
A result is a point-in-time check
DNS can vary by resolver and change over time. Verify important changes with your DNS provider and mail platform. Public DNS checks cannot see every private report or sending configuration.
Explore MailConfig ProFrequently asked questions
What does the MX lookup do?
Resolve mail exchange records, addresses and null-MX configuration.
Do I need an account?
No. This public tool is available without registration.