When using the Webserver Authentication no password and no message should be shown in the registration mail (allthough it would be nice to give an information to the user like "please use your domain password" or so).

The actual condition is this :

if (Yii::app()->getConfig("useWebserverAuth") === false) {...}

This will return always false, cause there is no entry in the config with 'useWebserverAuth'.

So the right condition is:

if (Yii::app()->getConfig("auth_webserver") === false) {...}