REVERSE HOSTNAME RESOLUTION
Reverse hostname resolution is used to find an IP address when a hostname is specified. Almost all the hostname resolution methods are used for both forward and reverse hostname resolution.
NOTE
Reverse hostname resolution is also used for security purposes. For example, Sendmail will not accept mail if it cannot resolve incoming mail server names. This feature prevents spamming.
Many systems need reverse hostname resolution for security and other purposes. When a system receives an incoming connection request, for example, it contains the IP address of the client machine. Before you allow or deny this connection request, you need to know whether the requesting system is trusted. If you need to compare the hostname ...
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