NTC uses an email service called MailChimp. If you are not receiving emails from us, they may be getting re-routed to the spam folder in your email account. Filling out this form, and registering with MailChimp should fix this problem, but depending on the service you use, you may also have to adjust your spam filters to allow these emails in.
You are only confirming your membership on our email list when you register. You email address is not shared with any other lists.