We've recently changed the registration process for new subscribers. This was implemented to improve the accuracy of spammer detection. Here's how it works now:
  1. New subscribers register and are automatically assigned to the registered users group.
  2. The first post for any registered user is 'unapproved' (moderated) by default.
  3. Admins check for moderated messages throughout the day and approve or reject them.
  4. Once per hour, registered users with approved messages are promoted to the approved users group.
  5. Approved users may post at will.