Código PHP:
<?php
// ------- aqui lo configuro -------------------------------------------------------
$valid_ref1="http://www.xxxx.com./contacto.html";// dominio
$valid_ref2="http://www.xxxx.com./contacto.html";// dominio
$replyemail="[email protected]";//email
// ------------------------------------------------------------
//clean input in case of header injection attempts!
function clean_input_4email($value, $check_all_patterns = true)
{
$patterns[0] = '/content-type:/';
$patterns[1] = '/to:/';
$patterns[2] = '/cc:/';
$patterns[3] = '/bcc:/';
if ($check_all_patterns)
{
$patterns[4] = '/\r/';
$patterns[5] = '/\n/';
$patterns[6] = '/%0a/';
$patterns[7] = '/%0d/';
}
//NOTE: can use str_ireplace as this is case insensitive but only available on PHP version 5.0.
return preg_replace($patterns, "", strtolower($value));
}
$name = clean_input_4email($_POST["name"]);
$email = clean_input_4email($_POST["email"]);
$thesubject = clean_input_4email($_POST["thesubject"]);
$themessage = clean_input_4email($_POST["themessage"], false);
$error_msg='ERROR - no enviado. Intente nuevamente.';
$success_sent_msg='<p http://www.alfonsobotello.com./contacto.html</p>';
$replymessage = "Hola $name
Gracias por su mensaje.
Contactaremos con usted a la brevedad posible, muchas gracias
Por favor no responda a este correo.
Su Email: $email
--------------------------------------------------
Asunto: $thesubject
Mensaje:$themessage
--------------------------------------------------
Gracias";
// email variable not set - load $valid_ref1 page
if (!isset($_POST['email']))
{
echo "<script language=\"JavaScript\"><!--\n ";
echo "top.location.href = \"$valid_ref1\"; \n// --></script>";
exit;
}
$ref_page=$_SERVER["HTTP_REFERER"];
$valid_referrer=0;
if($ref_page==$valid_ref1) $valid_referrer=1;
elseif($ref_page==$valid_ref2) $valid_referrer=1;
if(!$valid_referrer)
{
echo "<script language=\"JavaScript\"><!--\n alert(\"$error_msg\");\n";
echo "top.location.href = \"$valid_ref1\"; \n// --></script>";
exit;
}
$themessage = "Nombre: $name \nMensaje: $themessage
Cursos: $Cursos";
mail("$replyemail",
"$thesubject",
"$themessage",
"From: $email\nReply-To: $email");
mail("$email",
"$thesubject",
"$replymessage",
"From: $replyemail\nReply-To: $replyemail");
echo $success_sent_msg;
?> 
