Jnos works with an access control list. Here a small example what you can put in there. There are things double in it, this is just an example what is possible
# ACCESS CONTROL #=============== #Allow a specific Hostname (eerst ff wachten "now+0001" tot de dns online is) at now+0001 "tcp access permit packet-radio.net all" # Localhost (altijd handig) tcp access permit 127.0.0.1 all # Ampr.org (Compleet ampr.org netwerk) tcp access permit 44.0.0.0/8 all # Nederlands Ampr.org netwerk tcp access permit 44.137/32 all # Eigen Ampr.org netwerk tcp access permit 44.137.31.64/27 all # Lokaal netwerk tcp access permit 192.168.1.0/24 all # Lokaal netwerk met toegewezen poort tcp access permit 192.168.1.175/24 25 110 # Friendjes :) tcp access permit 82.176.45.213 all # blacklist bad logins for 15 minutes (900 seconds) mbox blacklist 900 # run expiry process every 20 minutes tcp access expiry 20 # Acces deny (Bad boy) tcp access deny 81.21.45.213 # Subnet access to ports 1 through 25, tcp access permit 23.1.46/24 1 25 tcp clean