Definitions for "Mail exchange record"
See MX record.
A list of hosts that accept mail for a domain and tell how to contact a domain. MX records are required to get mail to a disconnected host or to a system that is down, as well as to "distribute load" (give several hosts the same preference value). MX records are part of the DNS.
A DNS resource record type indicating which host can handle mail for a particular domain. See also: Domain Name System, Electronic Mail. [Source: MALAMUD