This file is indexed.

/usr/sbin/rmail is in masqmail 0.2.30-1.

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
#
# Dummy UUCP rmail command for postfix/qmail systems
#
# written by luciano l. mannucci <luke@nameron.smd.sublink.org>
# improved by Wietse Venema <wietse@porcupine.org>
# see: 
#      List:       postfix-users
#      Subject:    Rmail: very small fix
#      From:       luke@nameron.smd.sublink.org (luciano l. mannucci)
#      Date:       2000-09-13 14:31:30
#      URL:        http://marc.info/?l=postfix-users&m=96885536302087
#
# taken from postfix-2.5.5/auxiliary/rmail/rmail


SENDMAIL="/build/masqmail-czHGuw/masqmail-0.2.30/debian/masqmail/usr/sbin/masqmail"
IFS=" " read junk from junk junk junk junk junk junk junk relay

case "$from" in
 *[@!]*) ;;
      *) from="$from@$relay";;
esac

exec $SENDMAIL -i -f "$from" -- "$@"