You actually need a valid email address linked to your Bitcointalk account for security reasons tomorrow. And most importantly, hide it from public view and not use it for any activity here on this forum. Because if eventually you might have wrongly registered your account with a temporal invalid email address, then it's advisable to go make a re-change on it now by using a valid email address, whereby you will be receiving notifications. So that in case of an issue tomorrow or suspicious activity, you will be able to have access to it.