Have you considered MIME::Lite ?

It has the advantage that you can build up your own mime mail components. I was faced with a similar problem to yours in the past. I didn't need to use multiparts but I did do image inserts I used HTML::LinkExtor to grab all the images in the HTML page. I've included a code snippit if it will help:-

Notes:

• my_print() is my "special" debug print statement (only prints if debug enabled)
• $opts is my command line arguments hash $opts{'d'} was for debug :)
• $template was an HTML::Template object
• the script assumes that images to attach are local to its directory

Hope this helps

my $msg = MIME::Lite->new(
                From =>     $from_address,
                To =>       $email_address,
                Subject =>  $subject,
                Type =>     'text/html',
                Data =>     $template->output()
        );

#we need to add any images to the mail if they exist
my $parser = HTML::LinkExtor->new();
$parser->parse($template->output());
foreach my $link ($parser->links){
    if ($link->[0] eq 'img'){
        my_print("Image found [".$link->[2]."] ");
        if ($link->[2] =~ /^https?:\/\//){
            my_print("Absolute! Ignored.\n");
        }else{
            my ($imgtype,$junk) = reverse split '\.',$link->[2];
            $imgtype =~ s/^jpg$/jpeg/; #propper mime name?

            if(open(TEST,"<".$link->[2])){
                my_print("Attaching\n");
                close(TEST);
                $msg->attach(Type =>'image/'.$imgtype,
                             Path    =>$link->[2],
                             Filename=>$link->[2],
                             #Disposition => 'inline');
                             Disposition => 'attachment');
            }else{
                my_print("Not found, Skipped!!\n");
            }
        }
    }
}

if($opts{'d'}){
    #debug mode
    my_print($msg->as_string);
}else{
    $msg->send();
}
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