No se, pero proba con esto q a mi si me funciona:
$headers = "MIME-Version: 1.0 \r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1 \r\n";
$headers .= "From:
[email protected] \r\n";
// $headers .= "Reply-To:
[email protected]\r\n";
$headers .= "X-Mailer: Microsoft Outlook Express 6.00.2600.0000";
mail( "
[email protected]", "Asunto", "Mensaje", $headers );
suerte!