/etc/nagios-plugins/config/email_delivery.cfg is in nagios-plugins-contrib 16.20151226.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | define command{
command_name check_email_delivery
command_line /usr/lib/nagios/plugins/check_email_delivery -p '$USER1$/check_smtp_send -H $HOSTADDRESS$ --mailfrom $ARG3$ --mailto $ARG4$ -U $ARG5$ -P $ARG6$ --header "Subject: Nagios %TOKEN1%" -w $ARG1$ -c $ARG2$' -p '$USER1$/check_imap_receive -H $HOSTADDRESS$ -U $ARG5$ -P $ARG6$ -s SUBJECT -s "Nagios %TOKEN1%" -w $ARG1$ -c $ARG2$' -w $ARG1$,$ARG1$ -c $ARG2$,$ARG2$
}
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