Mail Exchanger (MX) Mail exchanger (MX) record. Provides message routing to a specified mail exchange host that is acting ...

Mail Exchanger (MX) Mail exchanger (MX) record. Provides message routing to a specified mail exchange host that is acting as a mail exchanger for a specified DNS domain name. MX records use a 16-bit integer to indicate host priority in message routing where multiple mail exchange hosts are specified. For each mail exchange host specified in this record type, a corresponding host address (A) type record is needed. (RFC 1035)