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MX (Mail Exchange) records tell the internet which mail servers handle email for a domain, and in what order of preference. This tool looks up a domain's MX records, sorted by priority, useful for verifying email setup or troubleshooting mail delivery.
How it works
Enter a plain domain name and the tool queries its MX records, sorting them by priority (a lower number means higher preference — mail servers try the lowest-priority record first).
- Enter domain.
- Click Calculate to see your results.
Examples
Multiple mail servers
A domain with several MX records (e.g. priority 10 and priority 20) uses the priority-10 server first, falling back to priority-20 only if the first is unavailable.
Who should use it
- Verifying email is routed to the correct mail provider.
- Troubleshooting email delivery issues.
Industry applications
- IT support and email administration
- Web development and hosting/DevOps
Advantages
- Instant lookup with no software installation.
- Automatically sorts multiple records by priority for clarity.
Limitations
- Shows current DNS state only — doesn't test whether the mail server itself is actually accepting connections.
Common mistakes to avoid
- Assuming the first MX record listed is always used — sorting by priority number (not list order) determines actual preference.
- Confusing MX records with A records — MX records point to a mail server's hostname, which then itself needs its own A/AAAA record to resolve to an IP.
Best practices
- When troubleshooting email delivery, verify both the MX record AND that the target mail server hostname itself resolves correctly.
- Check for a null MX record before assuming a missing MX list is a misconfiguration — it might be intentional.
Tips
- Pair this with the SPF and DMARC Record Checkers for a complete picture of a domain's email configuration and authentication.