Php mail component

require_once "Mail.php";

$from = "from id <From email id>";
$to = "to email id <to email id >";
$subject = "This is my subject";
$body = "Hi,\n\nHow are you?";

$host = "SMTP SERVER IP";
$username = "from email id";
$password = "password";

$headers = array ('From' => $from,
  'To' => $to,
  'Subject' => $subject);
$smtp = Mail::factory('smtp',
  array ('host' => $host,
    'auth' => true,
    'username' => $username,
    'password' => $password));

$mail = $smtp->send($to, $headers, $body);

if (PEAR::isError($mail)) {
  echo("<p>" . $mail->getMessage() . "</p>");
 } else {
  echo("<p>Message successfully sent!!</p>");
 }
?>