mail exchanger

mail exchanger

(messaging)
A server running SMTP Message Transfer Agent software that accepts incoming electronic mail and either delivers it locally or forwards it to another server. The mail exchanger to use for a given domain can be discovered by querying DNS for Mail Exchange Records.
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Once you register for an enterprise account and transfer your mail exchanger (MX) record to Google, everyone in your company can use a common Web address for accessing your company calendar, e-mail, shared documents and more.