MX Lookup
Find the mail exchangers for a domain, sorted by preference, with TTL. Useful for verifying MX records after a DNS change or diagnosing mail delivery issues.
Look up MX records
Queries Google Public DNS for mail exchangers and sorts them by preference. Runs in your browser.
What this shows
Mail exchanger (MX) records tell senders where to deliver email for a domain. The
lower the preference number, the higher the priority — senders attempt the lowest
number first and fall back to higher numbers.
Common checks
- After changing a mail provider. Make sure only the new provider’s MX records resolve. Leftover MX records from the old provider cause mail to be delivered to the wrong place intermittently.
- Before going live. MX records without corresponding A/AAAA records fail delivery silently. The host each MX points to must itself resolve.
- Debugging bounces. If a sender reports bounces, checking MX + SPF + DMARC together narrows the problem to a config mismatch vs. a receiver-side policy.
For a deeper look at why “DNS propagation” takes longer than it should, see The DNS propagation myth.