which_access open -> closed who_access open -> closed max_which_hits 0 -> 1 Those would allow a spammer to harvest all subscriber addresses if not changed by the list admin. Reported on http://online.securityfocus.com/archive/1/310113/2003-02-03/2003-02-09/0 Don't restrict the which arguments as the article suggests, though, because with which_access list and max_which_hits 1, there's no reason to destroy a useful command.