Configuring DNS to Support Exchange Servers
Because DNS is already required and integrated with Active Directory before Exchange Server is installed, most companies already have a robust DNS environment in place. Exchange by itself accesses DNS servers to find resources on the local network, such as Global Catalog servers and domain controllers. It also uses DNS to search for MX records of other domains.
External DNS Servers for the Internet
The external DNS server for Exchange (or any other mail system) is responsible for giving out the correct MX and A records for the domain for which it is authoritative. Administrators should take security precautions regarding who can change these records—and how. Intentionally or accidentally changing these ...
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