May 14 16:33:17 localhost nagios: SERVICE NOTIFICATION: nagiosadmin;hosting3;CPU Load;CRITICAL;notify-service-by-email;Connection refused by host
May 14 16:33:17 localhost nagios: Warning: Attempting to execute the command "/usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: PROBLEM\n\nService: CPU Load\nHost: hosting3.xdir.fr\nAddress: 91.121.29.133\nState: CRITICAL\n\nDate/Time: Mon May 14 16:33:17 CEST 2007\n\nAdditional Info:\n\nConnection refused by host" | /bin/mail -s "** PROBLEM Service Alert: hosting3.xdir.fr/CPU Load is CRITICAL **" myemail@somewhere.com" resulted in a return code of 127. Make sure the script or binary you are trying to execute actually exists...