Defining the email address which Nagios sends emails from

Hi currently Nagios sends notifications from [email protected], How do I go about configuring this? Thanks

In a default Nagios install, it's also defined in the host-notify-by-mail or service-notify-by-mail commands, which you'll find in commands.cfg. The default would be something like:

/bin/echo -e "$NOTIFICATIONTYPE$ - Service notification for $SERVICEDESC$ from host $HOSTNAME$ - $HOSTALIAS$\n$SERVICEDESC$: $SERVICEOUTPUT$\n" | /bin/mail -s '$NOTIFICATIONTYPE$/$SERVICESTATE$ - $HOSTNAME$/$SERVICEDESC$' $CONTACTEMAIL$

So just add a -r sender@address option to the mail command, and that should work.

Couldn't get the "-- -r [email protected]" solution to work. It turns out options after "--" are options for sendmail. Looking at sendmail options, it should be "-fnagios@domain" NOTE NO SPACE between -f and [email protected].

So the following is now working :-

  command_line    /usr/bin/printf "%b" "Notification Type: $NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTNAME$\Address: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$LONGSERVICEOUTPUT$" | /bin/mail -s "$SERVICESTATE$ - Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" $CONTACTEMAIL$ -- [email protected]

Put -r nagios@domain before $CONTACTEMAIL$ on commands.cfg

What worked for me was adding -r $ADMINEMAIL$ before the -s (immediately after /bin/mail), and of course $ADMINEMAIL$ has to be set in nagios.cfg using the admin_email setting.