About
Looks up MX hosts and priorities so you can see where mail for a domain should go.
How to use
Enter a domain without http://. MX is read from public DNS.
What this tool checks
Public DNS MX hostnames and priorities. It answers where mail should be handed off.
How to read the results
Multiple MX records are common. Backup MX has a higher preference number and may not take primary traffic.
Limits and data handling
Results come from server-side DNS and may differ from your local cache. No mail is sent.
FAQ
Is a smaller priority number better?
Lower MX preference values are tried first. Mail systems walk the list in that order.
What if there is no MX?
Some domains receive on an A record, but many senders treat no MX as undeliverable.
How is this different from Domain DNS Record Lookup?
Domain DNS Record Lookup shows several record types. This page focuses on MX so you can jump to SMTP Short Connection Test.
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