Possible to delete your membership and resign up with rakeback?

Is it possible (and at which sites) to delete your membership with any particular poker site, and then resign up (possibly w/ a different email) to take advantage of a rakeback deal? Cuz I had signed up with most sites before knowing about these rakeback deals, and would like to take advantage of them if at all possible. I'm worried it won't work because the site already has records of your Neteller account making transactions from a different user (ur old membership)