I would suggest using Email::MIME - you can do something like:

use strict;
use warnings;
                                                                      
+          
use Email::MIME;
use Email::Folder::Mbox;
                                                                      
+          
my @received;
my $box = Email::Folder::Mbox->new('/home/jonathan/mail/spam');
while ( my $mail = $box->next_message )
{
   my $main = Email::Simple->new($mail);
                                                                      
+          
   if ($main->header('Content-Type') and $main->header('Content-Type')
+ =~ /multipart/i )
   {
      my $mess = Email::MIME->new($mail);
                                                                      
+          
      foreach my $part ($mess->parts())
      {
         if ($part->content_type() =~ m%message/rfc822%i )
         {
            print $part->as_string();
         }
      }
   }
                                                                      
+          
}
[download]

/J\

With MIME::Parser, you can get the full rfc/822 message by using the $part->body_as_string method and feeding that back into a new/reused MIME::Parser object.