e-mail notifications not being sent

[Kaplan, Andrew H.]

Hi there --

I completed the installation of Nagios 3.3.1, and I am going through the testing
process. The server is able to successfully monitor
our various clients, but e-mail notifications for critical conditions are not
being sent to the intended recipient. The e-mail server that
is on the Nagios server is the Postfix message transfer agent. 

The troubleshooting steps that I have taken so far are the following:

1. I have been able to send a test e-mail from the Nagios server to the intended
recipient using two different mail commands. The test 
    e-mail was done from the command line using the mail and mailx commands
using the command syntax:

mail <e-mail address> < /etc/fstab 
mailx -s "test" <e-mail address> < /etc/fstab

2. I checked the contacts.cfg file, and confirmed the intended recipient is
listed with the correct address.

3. I checked the nagios.log, and there were entries that were similar to the
following:

[1321385615] Warning: Attempting to execute the command "/usr/bin/printf "%b"
"***** Nagios 2.6 *****\n\nNotification Type: PROBLEM\nHost: ... Date/Time: Tue
Nov 15 14:33:35 EST 2011\n" | 
/bin/mail -...<e-mail address>" resulted in a return code of 127.  Make sure the
script or binary you are trying to execute actually exists...

I did a search for the mail binary, and there was none at that location. To
correct the problem, I created a symbolic that pointed to the actual 
location of the mail binary which was located at the /usr/bin/ folder.

4. As far as I can tell, all hosts have e-mail notifications enabled on them.

What other steps do I need to take in order to get e-mail notifications to work
here?

Thanks. 




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