MX record (Mail Exchange record)
An MX record (Mail Exchange record) is a domain name system (DNS) server record
that contains information about which mail server the domain uses to receive mail.
An MX record can point to a mail server or a proxy server when there is a hosted
mail filtering process in place. In an on-premises deployment, the administrator can also point MX
records to a firewall that
uses internal forwarding rules to redirect inbound messages to an edge transport server handling
Internet-facing mail flow or an Exchange mailbox server.
Contributor(s): Matt Gervais
This was last updated in August 2012
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