When I try to register an AIM user from the register section in the openfire admin panel, it does NOT allow me to use a personal email (email@example.com). It forces me to not to use an email or use AIM email. But AIM lets people connect to their services w/ personal emails.
This problem does not occur when I edit a registration. So the work-around is to save some dummy user and then edit it to what it should be.