Hello,
thank you for the fast solution.
The "$wgUsersNotifiedOnAllChangeshttp://www.mediawiki.org/wiki/Manual:$wgUsersNotifiedOnAllChanges(formerly $wgUsers *Notifed*OnAllChanges!) - Array of usernames who will be sent a notification email for every change which occurs on a wiki"
is a nice function to see which changes were made.
*But:* is it also possible that "user_test" does not become E-Mails when he changes things? So every time i change things in the wiki, i get an email. But I would only like to get an email when someone writes into the discussion page (makes a comment through the comment extension) because the wiki itself is closed and used as website.