package Sisimai::Order;
use feature ':5.10';
use strict;
use warnings;

sub by      { return {} }
sub default { return [] }
sub another { return [] }
sub headers { return {} }

1;
__END__

=encoding utf-8

=head1 NAME

Sisimai::Order - Parent class for making optimized order list for calling MTA,
MSP, and CED modules

=head1 SYNOPSIS

    use Sisimai::Order

=head1 DESCRIPTION

Sisimai::Order class makes optimized order list which include MTA, MSP, and CED
modules to be loaded on first from MTA specific headers in the bounce mail 
headers such as X-Failed-Recipients. 
This module are called from only Sisimai::Message::* child classes.

=head1 AUTHOR

azumakuniyuki

=head1 COPYRIGHT

Copyright (C) 2015-2016 azumakuniyuki, All rights reserved.

=head1 LICENSE

This software is distributed under The BSD 2-Clause License.

=cut
