MX Lookup
See which mail servers receive email for a domain and the order senders try them in. Useful when moving to a new email provider or diagnosing undelivered mail.
Run a check
This tool isn’t available yet
MX Lookup is still in development. The form below previews how it will work, but it can’t be submitted and no checks are run.
Results
Results aren’t available yet
Results will appear here once MX Lookup launches.
How to use MX Lookup
- Enter the domain that appears after the @ in the email address.
- Run the lookup to retrieve the domain’s MX records.
- Check that the servers match your email provider’s instructions and that priorities are in the intended order.
What it checks
- MX records and their priority values
- Mail server hostnames
- IPv4 and IPv6 addresses for each mail server
- Missing or null MX configurations
Frequently asked questions
What does MX priority mean?
Each MX record has a preference value. Sending servers try the lowest value first and fall back to higher values if it’s unavailable. Records with equal values share the load.
What happens if a domain has no MX records?
Senders may fall back to the domain’s A or AAAA record. A domain that should never receive email can publish a “null MX” record — a single MX with a target of “.” — to say so explicitly.