I don't trust your is_tainted function. Try using the standard one instead: 
my $msg = MIME::Lite->new(    
                           To      => "$emailsite",
                           From    => "$from",
                           Subject => "Contato >> $assunto",
                           Type    => 'text/html',
                           Data    => "$html" );

use Scalar::Util qw(tainted); # This module is included in perl 5.8
my %test = ('$msg' => $msg, '$emailsite' => $emailsite,
            '$from' => $from, '$assunto' => $assunto, '$html' => $html
+);

my ($k, $v);
while (($k, $v) = each %test)
{
  if (tainted($v)) {print STDERR "$k is TAINTED\n";}
  else {print STDERR "$k is not tainted\n";}
}

$msg->send();

[download]
By the way, where did you get your is_tainted function? It's not the standard one suggested in perlsec
--
@/=map{[/./g]}qw/.h_nJ Xapou cets krht ele_ r_ra/;
map{y/X_/\n /;print}map{pop@$_}@/for@/

[download]

In reply to Re^5: Taint mode trap from Perl 5.6 to 5.8 - going mad! by fizbin
in thread Taint mode trap from Perl 5.6 to 5.8 by Andre_br

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