I have a problem with automatically mail notification in Nagios Core 4 installed on ubuntu 12 .04 lts server... i have tried to send mail with nagios user and root user with the command:

echo "test" | mail -s "test mail" [email protected]

and i received mail correctly...

but i don't receive any automatically mail notification...

i don't know how can i do to resolve this issue! :(

these are my configuration files (commands.cfg, contacts.cfg, nagios.log, mail.log):

commands.cfg (the path /usr/bin/mail is the right path):

# 'notify-host-by-email' command definition
define command{
        command_name    notify-host-by-email
        command_line    /usr/bin/printf "%b" "***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | /usr/bin/mail -s "** $NOTIFICATIONTYPE$ Host Alert: $HOSTNAME$ is $HOSTSTATE$ **" $CONTACTEMAIL$
        }

# 'notify-service-by-email' command definition
define command{
        command_name    notify-service-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$SERVICEOUTPUT$\n" | /usr/bin/mail -s "** $NOTIFICATIONTYPE$ Service Alert: $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$ **" $CONTACTEMAIL$
        }
# 'process-host-perfdata' command definition
define command{
        command_name    process-host-perfdata
        command_line    /usr/bin/printf "%b" "$LASTHOSTCHECK$\t$HOSTNAME$\t$HOSTSTATE$\t$HOSTATTEMPT$\t$HOSTSTATETYPE$\t$HOSTEXECUTIONTIME$\t$HOSTOUTPUT$\t$HOSTPERFDATA$\n" >> /usr/local/nagios/var/host-perfdata.out
        }
# 'process-service-perfdata' command definition
define command{
        command_name    process-service-perfdata
        command_line    /usr/bin/printf "%b" "$LASTSERVICECHECK$\t$HOSTNAME$\t$SERVICEDESC$\t$SERVICESTATE$\t$SERVICEATTEMPT$\t$SERVICESTATETYPE$\t$SERVICEEXECUTIONTIME$\t$SERVICELATENCY$\t$SERVICEOUTPUT$\t$SERVICEPERFDATA$\n" >> /usr/local/nagios/var/service-perfdata.out
        }

contacts.cfg:

define contact{
        contact_name                    supporto
        alias                           Supporto Clienti DEA
        service_notification_period     24x7
        host_notification_period        24x7
        service_notification_options    w,u,c,r
        host_notification_options       d,r
        service_notification_commands   notify-service-by-email
        host_notification_commands      notify-host-by-email
        email                           [email protected]
        }

define contactgroup{
        contactgroup_name       admins
        alias                   Nagios Administrators
        members                 supporto
        }

nagios.log:

[1401871412] SERVICE ALERT: fileserver;Current Users;OK;SOFT;2;USERS OK - 1 users currently logged in
[1401871953] SERVICE ALERT: backups;Nagios Status;WARNING;SOFT;1;NAGIOS WARNING: 36 processes, status log updated 541 seconds ago
[1401872133] SERVICE ALERT: backups;Nagios Status;OK;SOFT;2;NAGIOS OK: 36 processes, status log updated 180 seconds ago
[1401872321] SERVICE ALERT: posta;Swap Usage;CRITICAL;SOFT;1;CRITICAL - Plugin timed out after 10 seconds
[1401872322] SERVICE ALERT: fileserver;Current Users;CRITICAL;SOFT;1;CRITICAL - Plugin timed out after 10 seconds
[1401872420] SERVICE ALERT: archivio;Disk Space;CRITICAL;SOFT;1;CRITICAL - Plugin timed out after 10 seconds
[1401872492] SERVICE ALERT: fileserver;Current Users;OK;SOFT;2;USERS OK - 1 users currently logged in
[1401872492] SERVICE ALERT: posta;Swap Usage;OK;SOFT;2;SWAP OK: 100% free (1984 MB out of 1984 MB)
[1401872590] SERVICE ALERT: archivio;Disk Space;OK;SOFT;2;DISK OK
[1401872931] Auto-save of retention data completed successfully.
[1401873333] SERVICE ALERT: backups;Nagios Status;WARNING;SOFT;1;NAGIOS WARNING: 36 processes, status log updated 402 seconds ago
[1401873513] SERVICE ALERT: backups;Nagios Status;OK;SOFT;2;NAGIOS OK: 36 processes, status log updated 180 seconds ago

mail.log (i think that the problem is here but i don't know how to resolve it):

Jun  4 10:00:01 backups sm-msp-queue[6109]: My unqualified host name (backups) unknown; sleeping for retry
Jun  4 10:01:01 backups sm-msp-queue[6109]: unable to qualify my own domain name (backups) -- using short name
Jun  4 10:20:01 backups sm-msp-queue[7247]: My unqualified host name (backups) unknown; sleeping for retry
Jun  4 10:21:01 backups sm-msp-queue[7247]: unable to qualify my own domain name (backups) -- using short name
Jun  4 10:40:01 backups sm-msp-queue[8327]: My unqualified host name (backups) unknown; sleeping for retry
Jun  4 10:41:01 backups sm-msp-queue[8327]: unable to qualify my own domain name (backups) -- using short name
Jun  4 11:00:01 backups sm-msp-queue[9549]: My unqualified host name (backups) unknown; sleeping for retry
Jun  4 11:01:01 backups sm-msp-queue[9549]: unable to qualify my own domain name (backups) -- using short name
Jun  4 11:20:01 backups sm-msp-queue[10678]: My unqualified host name (backups) unknown; sleeping for retry
Jun  4 11:21:01 backups sm-msp-queue[10678]: unable to qualify my own domain name (backups) -- using short name

i'm at the last step and i want to finish this Nagios Core! :) Any help be appreciate!:)

host definition (this host have the disk almost full and it is in hard state but non notification) :

define host{
        use                     generic-host            ; Name of host template to use
        host_name               posta
        alias                   Server Posta ESA
        address                 10.10.2.102
        parents                 xen1, xen2
        icon_image              redhat.png
        statusmap_image         redhat.gd2
        }

service definition:

define service{
        use                             generic-service
        host_name                       xen1, maestro, xen2, posta, nas002, serv2, esasrvmi02, esaubuntumi
        service_description             Disk Space
        check_command                   ssh_all_disks!10%!5%
        }

Notification is allowed for the contact definition you gave, but is it also allowed at the the service level ?

sorry but i don't understand this thing! :(