How to integrate Aritic Mail with Zend?

<?php
require_once '$HOME/ariticmailid/Zend/library/Zend/Mail.php';
require_once '/$HOME/ariticmailid/Zend/library/Zend/Mail/Transport/Smtp.php';

$smtpServer = 'mail.ariticmail.com';
$username =
$password =

$config = array('ssl' => 'tls',
'port' => '25',
'auth' => 'login',
'username' => $username,
'password' => $password);

$transport = new Zend_Mail_Transport_Smtp($smtpServer, $config);

$mail = new Zend_Mail();

$mail->setFrom('sendeexampexample@example.com', 'Some Sender');
$mail->addTo('email@example.com','Some Recipient');
$mail->setSubject('Test Subject');
$mail->setBodyText('This is the text of the mail using Zend.');

$mail->send($transport);
?>