require_once "Mail.php";
$from = "myemail@email.com";
$to = "test@email.com";

$subject = "Test";
$body = "Hello";
$host = "mail.mysite.com";
$port = "myport";
$username = "myemail@email.com";
$password = "my_password";
$headers = array ('From' => $from,
  'To' => $to,
  'Subject' => $subject);
$smtp = Mail::factory('smtp',
  array ('host' => $host,
    'port' => $port,
    'auth' => true,
    'username' => $username,
    'password' => $password));
$mail = $smtp->send($to, $headers, $body);
if (PEAR::isError($mail)) {
  echo($mail->getMessage());
 } else {
  echo("success!");
 }