//
// If we have a mail configuration, set that up.
//
if (isset($config_obj->smtp)) {
    $transport = new Zend_Mail_Transport_Smtp($config_obj->smtp->host, $config_obj->smtp->toArray());
    Zend_Mail::setDefaultTransport($transport);
}

// config.ini

smtp.auth = "login"
smtp.host = "host"
smtp.username = "username"
smtp.password = "password"