You might want to use MIME::Lite instead. Here is some code (that I also shamelessly lifted from the docs). It viewed and printed correctly using Outlook Express. I liked the module installation and 'feel' of the code better too: 
use strict;
use warnings;
use MIME::Lite;

my $msg = MIME::Lite->new(
                 To      =>'someone@somewhere.net',
                 Subject =>'HTML with in-line images!',
                 Type    =>'multipart/related'
                 );
    $msg->attach(Type => 'text/html',
                 Data => qq{ <body>
                             Here's <i>my</i> image:
                             <img src="cid:myimage.gif">
                             </body> }
                 );
    $msg->attach(Type => 'image/gif',
                 Id   => 'myimage.gif',
                 Path => '/some/path/myimage.gif',
                 );
    $msg->send();

[download]
Update: It also views/prints correctly under Mozilla 1.2.1

--Jim

In reply to Re: Sending Inline Images in e-mail with Mail::Sender (or getting them to print in Outlook) by jlongino
in thread Sending Inline Images in e-mail with Mail::Sender (or getting them to print in Outlook) by vroom

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