on *:join:#: { 
  if ($address($nick,3) isin %blacklist) { 
    kick $chan $nick You are Blacklisted, $nick >> %kbnoobs <<
  } 
} 
alias blacklist { 
  set %blacklist %blacklist $address($1,3) 
} 
alias unblacklist { 
  set %blacklist $remove(%blacklist,$address($1,3)) 
}