private static function getSmtpTransport($server, $port, $user, $pass, $encryption = null)
{
$transport = \Swift_SmtpTransport::newInstance($server, $port)->setUsername($user)->setPassword($pass);
if (in_array($encryption, array('ssl', 'tls'))) {
$transport->setEncryption($encryption);
}
return $transport;
}