This file is indexed.

/usr/share/qpsmtpd/plugins/auth/authdeny is in qpsmtpd 0.84-9.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#!/usr/bin/perl
#
#  This plugin doesn't actually check anything and will fail any
#  user no matter what they type.  It is strictly a proof of concept for
#  the Qpsmtpd::Auth module.  Don't run this in production!!!
#

sub hook_auth {
    my ( $self, $transaction, $method, $user, $passClear, $passHash, $ticket ) =
      @_;

    #  $DB::single = 1;

    $self->log( LOGWARN, "Cannot authenticate using authdeny" );

    return ( DECLINED, "$user is not free to abuse my relay" );
}