Code:
alias masspm {
  if (!$3) { echo $color(info) -a * /masspm: insufficient parameters | return }
  var %i = 1,%msg = $3-
  while ($nick(#,%i,a,r)) { .msg $v1 %msg | inc %i }
  echo -a -> masspm $+(#,:) %msg $iif((%i > 10),4You have mass messaged more then ten users which may result in you flooding off the server.)
}