The author of this module is a giant weirdo.

Have you tried

use Data::Dumper;
use Mail::Message::Construct;
print Dumper(
    Mail::Message->read(\"Subject:hello\n\n1\n2\n")
);
__END__
$VAR1 = bless( {
                 'MM_labels' => {},
                 'MM_modified' => 0,
                 'MR_trace' => 4,
                 'MM_head' => bless( {
                                       'MMH_fields' => {
                                                         'message-id' 
+=> bless( [
                                                                      
+            'Message-ID',
                                                                      
+            ' mailbox-fjord-232-1041916062
'
                                                                      
+          ], 'Mail::Message::Field::Fast' ),
                                                         'subject' => 
+bless( [
                                                                      
+         'Subject',
                                                                      
+         ' hello
'
                                                                      
+       ], 'Mail::Message::Field::Fast' )
                                                       },
                                       'MR_trace' => 4,
                                       'MMH_begin' => 0,
                                       'MMH_order' => [
                                                        $VAR1->{'MM_he
+ad'}{'MMH_fields'}{'subject'},
                                                        $VAR1->{'MM_he
+ad'}{'MMH_fields'}{'message-id'}
                                                      ],
                                       'MMH_message' => $VAR1,
                                       'MMH_modified' => 1,
                                       'MMH_end' => '15',
                                       'MR_log' => 4
                                     }, 'Mail::Message::Head::Complete
+' ),
                 'MM_message_id' => 'mailbox-fjord-232-1041916062',
                 'MM_trusted' => 0,
                 'MM_body' => bless( {
                                       'MMBL_array' => [
                                                         '1
',
                                                         '2
'
                                                       ],
                                       'MM_modified' => 0,
                                       'MMB_end' => '19',
                                       'MMB_type' => bless( [
                                                              'Content
+-Type',
                                                              ' text/p
+lain; charset="us-ascii"
'
                                                            ], 'Mail::
+Message::Field::Fast' ),
                                       'MMB_begin' => '15',
                                       'MR_trace' => 4,
                                       'MMB_seqnr' => 0,
                                       'MMB_checked' => 0,
                                       'MMB_message' => $VAR1,
                                       'MMB_disposition' => bless( [
                                                                     '
+Content-Disposition',
                                                                     '
+ none
'
                                                                   ], 
+'Mail::Message::Field::Fast' ),
                                       'MMB_eol' => 'NATIVE',
                                       'MR_log' => 4,
                                       'MMB_transfer' => bless( [
                                                                  'Con
+tent-Transfer-Encoding',
                                                                  ' no
+ne
'
                                                                ], 'Ma
+il::Message::Field::Fast' )
                                     }, 'Mail::Message::Body::Lines' )
+,
                 'MR_log' => 4
               }, 'Mail::Message' );
[download]

cause it works for me (same with what you got).

Also, what version of that distribution do you have, cause the latest copy of Mail::Message (our $VERSION = 2.034; # Part of Mail::Box) is only around 550 lines long.

MJD says you can't just make shit up and expect the computer to know what you mean, retardo! ** The Third rule of perl club is a statement of fact: pod is sexy.