For a file upload form, MIME::Lite is the way to go, but I found a really old one I did a while back that uses MIME::QuotedPrint and MIME::Base64 if you are interested -- it's old, but should give you a good place to start and some ideas. Sort of the full calorie MIME::Lite. I echo joost about the danger of spammer abuse with a script like this -- is this form going to be wide open to the net?

#!/usr/bin/perl -w

use MIME::Base64;
use MIME::QuotedPrint;
use Mail::Sendmail;

use CGI qw(:standard);
use CGI::Carp qw/ fatalsToBrowser /; # remove for production

my $cgi = new CGI;

print $cgi->header;
print $cgi->start_html();

#get values as below
my $a_File =  $cgi->param('image');

...

if($a_File =~ m!/!){
    @data = split /\//, $a_File;
    $a_Filename = pop @data;
  }elsif($a_File =~ m!\\!){
    @data = split /\\/, $a_File;
    $a_Filename = pop @data;
  }else{
    $a_Filename = $a_File;
}

if ($a_Filename){
    open(a_tmpFile, "</tmp/$a_Filename") or die $!;
    binmode a_tmpFile; undef $/;

    while(<a_tmpFile>){
        $base64_a_File = $base64_a_File . encode_base64($_);
    }
    close a_tmpFile;
}

###########  MESSAGE #####################

%mail = (
        SMTP    => '',
        from    => '',
        to      => '',
        subject => '',
        );
        
$boundary = "====" . time() . "====";
$mail{'content-type'} = "multipart/mixed; boundary=\"$boundary\"";

$boundary = '--'.$boundary;
$mail{body} = <<END_OF_BODY;
$boundary
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

if($a_Filename){
    $mail{body} = $mail{body} . <<END_OF_A_FILE;
    $boundary
}

#would list all params here
#param: $value as examples below

Contact Name:      $contactName  
Contact Phone:      $contactPhone  
Contact Email:      $contactEmail 


if($a_Filename){
$mail{body} = $mail{body} . <<END_OF_A_FILE;
$boundary

Content-Type: application/octet-stream; name="$a_Filename"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="$a_Filename"

$base64_a_File
END_OF_A_FILE
}

END_OF_BODY

sendmail(%mail) || print "Error: $Mail::Sendmail::error\n";

print "<p><b>Thank You.</b>";
#END
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note: This is an old script and I stripped out the extraneous code and left what is important, thus it is untested.