Code:
on *:JOIN:#Channel:{
  if (($nick != blabla) && ($nick != boem) && ($nick != lala)) {
    set %version.onjoin 1
    .ctcp $nick VERSION
  }
}

on *:CTCPREPLY:VERSION*:{
  if (%version.onjoin) { 
    msg $nick Version reply successful.
    unset %version.onjoin
  }
}