CC-4300: System -> Preference: Please add a option let user choose if the SMTP server requires User Authentication

-small fix

airtime_mvc/application/models/Email.php

@@ -35,7 +35,7 @@ class Application_Model_Email
                 );
             } else {
                 $config = array(
-                    'ssl' => 'ssl'
+                    'ssl' => 'tls'
                 );
             }