This is the TFL-listed fanlisting for the Ravenclaw house, one of the four houses of Hogwarts School of Witchcraft and Wizardry. It's listed at TheFanlistings.org, under the TV/Movie/Book Miscellany category.
Quite simply, a fanlisting is a site that gathers a list of fans of a particular subject. It is -not- a mailing list. If you're concerned about your e-mail address being listed, simply state on the join form that you'd like it to be hidden.
For more, visit thefanlistings.org.