Automatic RSS Feed Subscription at Registration

Hi all, quite simply I was looking for the ability to have the user signed up to receive my RSS FEED via email at registration using the email address they use to register. Ideally, it’d be a little checkbox that say ‘Receive new posts and updates via email?’ that is checked and they can choose to uncheck.

Important: I am looking for FEEDS not something like Subscribe2 plugin because I can’t add adsense to those emails.

Thanks!!