NTA communicates online with its Candidates through the Registered Email Id and Mobile number. So it is important to have an active Registered Email id so as not to lose out on any important information. If your Registered Email Id is working, there should not be any reason as to why NTA would communicate at your Alternative Email Id. And NTA Information Bulletin clearly mentions that all communication is through Registered Email and Mobile number.  No where does it mention that Communication also can be through Alternative Email Id. So do not worry about the admit card being sent at the Alternative email id. It will be sent only at your Registered Email Id.

Hello,

Don't worry about it. You have the email ID which is the official one. For admit card, you can download from NTA offical webpage if you don't get by mail.

Make sure to check out for email ID. if all the details are correct then it will be very helpful else you have to make another email using the same name.  You shouldn't have deleted it now. once all the process is completed , you can delete or change or do whatever you want.

for now don't change any of the registered email id, phone number. You will be at loss and no one else will suffer for you. check out for details once admit card is released and restore email id if possible.

Hope it helps!