Free Email Checker MX Lookup
MX Record Lookup
Free MX record lookup – instantly check any domain's mail server (MX) records and priority to diagnose delivery problems or confirm DNS setup.
What is an MX record?
An MX (Mail Exchange) record is a DNS entry that tells the internet which mail server is responsible for receiving email on behalf of a domain. Without at least one valid, correctly prioritized MX record, a domain cannot receive mail at all – so checking it is usually the first step in diagnosing a delivery problem.
What this lookup shows
Enter any domain to see every MX record it publishes, along with each record's priority number. Lower priority numbers are tried first; a domain with several records is simply listing backup mail servers in case the primary one is unreachable.
Common reasons to run this check
- Confirming a new domain is ready to receive mail after DNS changes.
- Diagnosing bounced messages – a missing MX record is one of the most common causes.
- Verifying that a migration to a new email provider (e.g. moving to Google Workspace or Microsoft 365) has fully propagated.
- Spotting typos in an email address before adding it to a mailing list – a domain with no MX record at all is a strong red flag.
DNS changes can take anywhere from a few minutes to 48 hours to fully propagate, so a fresh check after any DNS edit is the fastest way to confirm the change actually took effect.
Frequently Asked Questions
What does it mean if a domain has no MX records?
It cannot receive email at all – any message sent to that domain will bounce until a valid MX record is added.
How long after a DNS change will the new MX record show up here?
Usually within minutes, though full propagation across all DNS resolvers can take up to 48 hours.
What does the priority number next to each record mean?
Lower numbers are tried first; higher numbers are backup mail servers used only if the primary one is unreachable.