PHP Form to email help please

<?
include("Mail.php");

$recipients = "mail_to@domain.mail";

$headers["From"]    = "mail_from@domain.mail";
$headers["To"]      = "mail_to@domain.mail";
$headers["Subject"] = "Test message";

$body = "TEST MESSAGE!!!";

$params["host"] = "10.14.0.16";
$params["port"] = "25";
$params["auth"] = false;
$params["username"] = "user";
$params["password"] = "password";

// Create the mail object using the Mail::factory method
$mail_object =& Mail::factory("smtp", $params);

$mail_object->send($recipients, $headers, $body);
?>