/etc/init.d/courier-mta is in courier-mta 0.73.1-1.6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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### BEGIN INIT INFO
# Short-Description: Courier SMTP server
# Provides:          courier-mta
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
### END INIT INFO
# include init functions
. /lib/lsb/init-functions
prefix="/usr"
exec_prefix=${prefix}
sysconfdir="/etc/courier"
sbindir="${exec_prefix}/sbin"
libexecdir="${prefix}/lib/courier"
DAEMON=${sbindir}/esmtpd
test -f $DAEMON || exit 0
test -f "$sysconfdir/esmtpd" || exit 0
test -f "$sysconfdir/esmtpd-msa" || exit 0
# Check if SMTP server should be started
. ${sysconfdir}/esmtpd
START_MTA=no
case "$ESMTPDSTART" in
	[yY]*)START_MTA=yes;;
esac
START_MSA=no
. ${sysconfdir}/esmtpd-msa
case "$ESMTPDSTART" in
	[yY]*)START_MSA=yes;;
esac
if [ "$START_MTA" = "no" ] && [ $START_MSA = "no" ]; then
	exit 0
fi
case "$1" in
start)
	cd /
	
	# ensure proper permissions on /var/run/courier
	chgrp daemon /var/run/courier
	chmod g+rwx /var/run/courier
	echo -n "Starting Courier mail server:"
	${sbindir}/courier start
	echo " done."
	echo -n "Starting Courier mail filter:"
    ${sbindir}/courierfilter start
    echo " done."
	if [ "$START_MTA" = "yes" ]; then
		echo -n "Starting Courier SMTP server:"
		${sbindir}/esmtpd start
		echo " done."
	fi
	if [ "$START_MSA" = "yes" ]; then
		echo -n "Starting Courier SMTP MSA server:"
		${sbindir}/esmtpd-msa start
		echo " done."
	fi
	;;
stop)
	cd /
	if [ "$START_MSA" = "yes" ]; then
		echo -n "Stopping Courier SMTP MSA server:"
		${sbindir}/esmtpd-msa stop
		echo " done."
	fi
	if [ "$START_MTA" = "yes" ]; then
		echo -n "Stopping Courier SMTP server:"
		${sbindir}/esmtpd stop
		echo " done."
	fi
	echo -n "Stopping Courier mail filter:"
	${sbindir}/courierfilter stop
    echo " done."
	echo -n "Stopping Courier mail server:"
	${sbindir}/courier stop
	echo " done."
	;;
force-reload)
	cd /
	if [ "$START_MSA" = "yes" ]; then
		echo -n "Restarting Courier SMTP MSA server:"
		${sbindir}/esmtpd-msa restart
		echo " done."
	fi
	if [ "$START_MTA" = "yes" ]; then
		echo -n "Restarting Courier SMTP server:"
		${sbindir}/esmtpd restart
		echo " done."
	fi
	echo -n "Restarting Courier mail filter:"
	${sbindir}/courierfilter restart
    echo " done."
	echo -n "Restarting Courier mail server:"
	${sbindir}/courier restart
	echo " done."
    ;;
restart)
	$0 stop
	$0 start
	;;
*)
	echo "Usage: $0 {start|stop|restart|force-reload}" >&2
	exit 1
	;;
esac
exit 0
 |