您可以使用user_register 钩住并邮寄所有订阅者。类似于：

add_action(\'user_register\',\'notify_new_member\');

function notify_new_member(){
  global $wpdb;
  $usersarray = $wpdb->get_results("SELECT user_email FROM $wpdb->users;");    
  $users = implode(",", $usersarray);
  mail($users, "New Member", \'A new member has just joined.\');
}