Hello all, I've recently installed nagios 2.0 on Redhat 9, and I believe I have all configs setup correctly. Pre-flight check comes up ok and I check the nagios logs and the alerts show up, but for some reason I am not receiving any emails. I left the defaults for the "notify-by-email" command as described below:

# 'notify-by-email' command definition
define command{
command_name notify-by-email
command_line /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\n\nService: $SERVICEDESC$\nHost: $HOSTALIAS
$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$" | /bin/mail -s "** $NOTIFICATION
TYPE$ alert - $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" $CONTACTEMAIL$
}

Here is the context of my contacts.cfg:

define contact{
contact_name jeff
alias Jeff
contactgroups engsvcs
service_notification_period 24x7
host_notification_period 24x7
service_notification_options w,u,c,r,f,n
host_notification_options d,u,r,f,n
service_notification_commands notify-by-email
host_notification_commands host-notify-by-email
email jeff.mylastname@mycompany.com
}

I have cronjobs that send mail to me, and my sendmail is definitely turned on...what else could I be missing???

In the service or host definitions have you got a line like:
contact_groups engsvcs

Hi David, here is my services and hosts configuration:

# Service definition
define service{
use generic-service ; Name of service template to use
host_name engsvcs
service_description ping
is_volatile 0
check_period 24x7
max_check_attempts 10
normal_check_interval 5
retry_check_interval 10
contact_groups engsvcs
notification_interval 10
notification_period 24x7
notification_options c,r,w,u,f
check_command check_ping!100.0,20%!500.0,60%
}

# HOSTS
define host{
host_name engsvcs
alias engsvcs
address 10.17.9.254
check_command check-host-alive
max_check_attempts 10
process_perf_data 0
contact_groups engsvcs
hostgroups lab
check_period 24x7
obsess_over_host 1
retain_nonstatus_information 0
notifications_enabled 1
notification_interval 30
notification_period 24x7
notification_options u,r,d
}

I believe I have the configs set correctly, but let me know if you have any other recommendations/suggestions...thank you!