4
There are 3 activation options:
1. requires activation by the user (recommended)
This option sends an activation link to the users imputed email address, like the one you had when you signed up at Xoops. Periodically, you can go in and see who hasn't activated their accounts and either email them or delete them.
2. Activate Automatically
Not what you want
3. Activation by Administrators
alot of work.