This file is indexed.

/usr/sbin/mailer is in john 1.8.0-2.

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/sh
#
# This file is part of John the Ripper password cracker,
# Copyright (c) 1996-98 by Solar Designer
#

if [ $# -ne 1 ]; then
	echo "Usage: $0 PASSWORD-FILE"
	exit 0
fi

if [ ! -f /etc/john/john-mail.conf ]; then
       echo "Couldn't find /etc/john/john-mail.conf -- stopping!"
       exit 0
fi

if [ ! -f /etc/john/john-mail.msg ]; then
        echo "Couldn't find /etc/john/john-mail.msg -- stopping!"
        exit 0
fi

# In Debian, john should be in /usr/sbin. "john" binaries in other
# locations should not be used.
JOHNDIR=/usr/sbin

# Let's get stuff from conf file:
SHELLS=`grep   -e "^[ ]*shells[ ]*=[ ]*"  /etc/john/john-mail.conf | sed "s/.*=[ ]*//"`
MAILCMD=`grep  -e "^[ ]*mailcmd[ ]*=[ ]*" /etc/john/john-mail.conf | sed "s/.*=[ ]*//"`
MAILARGS=`grep -e "^[ ]*mailargs[ ]*=[ ]*" /etc/john/john-mail.conf | sed "s/.*=[ ]*//"`

# Let's start
$JOHNDIR/john -show "$1" -shells:$SHELLS | sed -n 's/:.*//p' |
(
	SENT=0

	while read LOGIN; do
		echo Sending mail to "$LOGIN"...

# Sends a message to each user; a template is in /etc/john/john.msg
# Subject, Reply-to, and other header lines should be put
# at the top of that file.
        sed -e 's/@LOGIN/'$LOGIN'/g' \
            -e 's/@HOSTNAME/'$(hostname)'/g' /etc/john/john-mail.msg |
        $MAILCMD $MAILARGS $LOGIN

		SENT=$(($SENT+1))
	done

	if [ ! $SENT -eq 0 ]; then
	    echo "John has cracked $SENT passwords. If you want to see them,"
	    echo "use john -show <passwordfile>. (See john(1) for details)."
	fi
)