Almost no emails

Hi, I just installed this for the first time, and it does not seem to work for me. I tried logins almost 10 times now, and only once did I receive a notification. That was when I logged in with my own admin account. Perhaps I’m not understanding this corre ctly? Does this plugin only send notifications to the users who logged in? But then, when a login fails, who is supposed to receive the notification? I received none, neither on my admin email, nor on two others that I entered. I’m trying to use Login Notifier on one child site of a multisite. Thanks! Ralf