Okay, that would work.
What I would like would be something where, once they are registered, there's a page where they can click on which mailings they would like to get and then the site admin can send emails out to those who selected those mailing groups. Someone might be part of multiple groups.
The registrant would also be able to access their account and add or remove groups they want to be a part of. The screen shots on the product page are more from the admin point of view, but I want to make sure the user can do these things too. Am I correct in assuming that this is possible?