MX Lookup
Verify Mail Exchange records and email server priorities.
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About MX Records
Mail Exchange (MX) records are DNS records that are necessary for delivering email to your address. They tell the world which mail servers accept incoming mail for your domain and where emails sent to your domain should be routed.
Priority
MX records have a "preference" or "priority" value. Lower numbers have higher priority. Backup servers usually have higher numbers.
Redundancy
Most domains have multiple MX records to ensure emails are not lost if one server is down.