Dear Sandra, NTA doesn't communicate with the candidates offline via post. In the world of technology, it makes it easier and sensible enough to communicate via electronic media. So all the communication like the corrections that you need to make in your application, notification regarding downloading your admit card, counselling schedules and processes will all be conveyed through Email. Hence its important that you have the Email Id intact. After you download your admit card, if you find any discrepancies, if you have to reach out to them, it should be through your Registered Email Id.