Scripting Nagios Custom checks is not that hard. Its a case of getting hold of group of commands, piping them and extracting the Status of a Service and then passing them as Variables with If THEN ELSE STATEMENTS, that in-turn informs Nagios the status of the Service being monitored.

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This article shows you how to install and configure a simple mail server called Postfix. It can be used to send emails or act as a email relay server for internal network wherein only one Server is allowed access to Internet and then all clients hosts will redirect email to this Postfix email relay server.

We would need to install two packages via YUM.

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