This file is indexed.

/usr/lib/courier/courierctl.start is in courier-mta 0.66.1-1ubuntu4.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/bash
#
# Copyright 1998 - 2005 Double Precision, Inc.  See COPYING for
# distribution information.
#
# This is a sample script to start Courier, reading the configuration from
# ${sysconfdir}/courierd

prefix="/usr"
exec_prefix="/usr"
sysconfdir="/etc/courier"
libexecdir="${prefix}/lib/courier"

cd ${prefix}

/usr/bin/env -i /bin/bash -c "set -a ; . ${sysconfdir}/courierd; ( ${libexecdir}/courier/courierd & )"