Is admin a default receiver of messages sent to a server?

I have set xmpp.forward.admins with admin@server and Administrator was getting messages sent to server’s domain address. Then i have changed it to test@server and then Test was getting that messages. After i have deleted that property, Administrator is still getting such messages. Is admin the default user to get such messages? I havent tested sending these messages before setting that property, so i’m not sure was it working this way before, or maybe it just cant clear that property normally.