From HEXONET Wiki
ICANN now stipulates that as a Registrant of a domain name or by changing your name or email address for existing gTLD and nTLD domains, you need to verify your contact information. For new registrations you must verify your email address. For changes to existing domain names, you must verify the name or email modification. Please note that without timely verification (15 days) of your email address or modified contact information, you can't fully manage your domain name and your domain name will stop resolving after its respective Verification Deadline Date.