<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7654.12"> <TITLE>e-mail notifications not being sent</TITLE> </HEAD> <BODY>  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. The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.</BODY> </HTML>