When more than one MX record is entered for any single domain name that is using more than one mail server, the MX record can be prioritized with a preference number that indicates the order in which the mail servers should be used. This enables the use of primary and backup mail servers.
MX record
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Short for mail exchange record, an entry in a domain name database that identifies the mail server that is responsible for handling e-mails for that domain name.
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