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Lately, I was configuring Nagios and most of the systems were on the same private IP block as the Nagios server. One of the servers was outside the LAN and I was using the allowed_hosts directive for nrpe daemons where I needed to put the external IP of Nagios server in nrpe configuration of [...]

Often times, we want to send log files or other emails from command line or want to script them. In this tutorial, I will show you how to do that using two mail clients mail and mutt.