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define service {
        host_name       localhost
        service_description     mailq
        check_period    24x7
        check_command   check_mailqueue!100!200
        contact_groups  admins
        notification_period     24x7
        initial_state   o
        check_interval  5.000000
        retry_interval  1.000000
        max_check_attempts      4
        is_volatile     0
        parallelize_check       1
        active_checks_enabled   1
        passive_checks_enabled  1
        obsess_over_service     1
        event_handler_enabled   1
        low_flap_threshold      0.000000
        high_flap_threshold     0.000000
        flap_detection_enabled  1
        flap_detection_options  o,w,u,c
        freshness_threshold     0
        check_freshness 0
        notification_options    u,w,c,r
        notifications_enabled   1
        notification_interval   0.000000
        first_notification_delay        0.000000
        stalking_options        n
        process_perf_data       1
        failure_prediction_enabled      1
        retain_status_information       1
        retain_nonstatus_information    1
        }

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root@mail-2018:~# sudo -u nagios /usr/lib/nagios/plugins/check_mailq -w 10 -c 20 -v
OK: postfix mailq reports queue is empty|unsent=0;10;20;0

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define command{
        command_name check_mailqueue
        command_line $USER1$/check_mailq  -w '$ARG1$' -c '$ARG2$' -M postfix
}

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sudo -u nagios /usr/lib/nagios/plugins/check_mailq -w 10 -c 20 -M postfix

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root@mail-2018:~# sudo -u nagios /usr/lib/nagios/plugins/check_mailq -w 10 -c 20 -M postfix
OK: postfix mailq reports queue is empty|unsent=0;10;20;0

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This plugin uses the system mailq command (sendmail) or qmail-stat (qmail)
 to look at the queues. Mailq can usually only be accessed by root or
 a TrustedUser. You will have to set appropriate permissions for the plugin to work.

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define command{
        command_name check_mailqueue
        command_line sudo $USER1$/check_mailq  -w '$ARG1$' -c '$ARG2$' -M postfix
}

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nagios ALL = NOPASSWD:/usr/lib/nagios/plugins/check_mailq *