Why can’t I create a new account with the same email address as an account I deleted?
You can, but you have to be patient. Since we reserve a seven-day period for you to reactivate your old account, you’re unable to register a new one until we’re sure you don’t want to reactivate. We recommend waiting until the reactivation period is over. If you just can’t wait until then (because our community and services are that awesome), then you’re welcome to register a new account with a different email address.
See more at – opera website