/usr/sbin/authdaemond is in courier-authdaemon 0.66.4-9.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | #! /bin/bash
#
#
# Copyright 1998 - 2004 Double Precision, Inc. See COPYING for
# distribution information.
#
# Courier authentication daemon startup script.
prefix=/usr
exec_prefix=/usr
sbindir=/usr/sbin
localstatedir=/var/lib/courier
set -a
. /etc/courier/authdaemonrc
exec ${sbindir}/courierlogger -pid=/run/courier/authdaemon/pid $LOGGEROPTS -$1 /usr/lib/courier/courier-authlib/authdaemond
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