yes, the NSA routinely installs bugs in the source code of free software.

sorry, couldn't help myself

seriously: you didn't cut-and-paste properly, the example you need is in the documentation:

$sender->OpenMultipart({to => 'Perl-Win32-Users@activeware.foo',
                       subject => 'Mail::Sender.pm - new module'});
 $sender->Body;
 $sender->Send(<<'*END*');
 Here is a new module Mail::Sender.
 It provides an object based interface to sending SMTP mails.
 It uses a direct socket connection, so it doesn't need any
 additional program.


 Enjoy, Jenda
 *END*
 $sender->SendFile(
  {description => 'Perl module Mail::Sender.pm',
   ctype => 'application/x-zip-encoded',
   encoding => 'Base64',
   disposition => 
    'attachment; filename="Sender.zip"; type="ZIP archive"',
   file => 'sender.zip'
  });
 $sender->Close;
[download]

And then there's the question whether you should use HTML in the body of an e-mail at all....

--
Brigitte    'I never met a chocolate I didnt like'    Jellinek
http://www.horus.com/~bjelli/         http://perlwelt.horus.at