Nagios mail directory is missing

[MurbiesWalto]

I've implemented Nagios 3.5.1 on one node to monitor basic metrics coming from Ganglia gmetad and gmond clients to Nagios via ganglia-nagios-bridge.py script.

Currently, I'm having issues with alerts, as e-mails do not get sent out, even when I can see alerts being logged in the Nagios web UI. One suspicion I have is that there are 2 missing missing files, /var/spool/mail/nagios and /var/mail/nagios. I would like to find out why these 2 files are missing, and what I can do to work around this.

The following is my contacts.cfg file:

define contact{
contact_name nagiosadmin ; Short name of user
use generic-contact ; Inherit default values from generic-contact template (defined above)
alias Nagios Admin ; Full name of user

email brazelton.w.mann@hpe.com ; <<***** CHANGE THIS TO YOUR EMAIL ADDRESS ******
}


###############################################################################
###############################################################################
#
# CONTACT GROUPS
#
###############################################################################
###############################################################################

# We only have one contact in this simple configuration file, so there is
# no need to create more than one contact group.

define contactgroup {
contactgroup_name admins
alias Nagios Administrators
members nagiosadmin
}
I've validated I can use the mail command to send e-mails to this address. Operations system: Red Hat Enterprise Linux 6.6.

Commands run to install nagios and dependent components:

yum install httpd

yum install mailx

yum install nagios

yum install nagios-www

yum install nagios-plugins-all

yum install nagios-plugins-nrpe

yum install php

[Jaske09]

Assuming that all performance data would be plotted on the same chart, I have the script returning separate groupings of performance data dependent on flags.