ICANN has made some recent mandatory changes to the process of updating domain Registrant contact info known as a “Change of Registrant”. The implementation of this policy is imposed on all registrars. The process triggers if any changes are made to domain Registrant's name, organization, email address, or ADMIN email address.
Complete details are listed under ICANN new Transfer Policy and is in effect starting December 1, 2016. Please visit this link for details:
Under this process:
When you update your Registrant info for a domain, this new process sends an email to the existing email address (being replaced) and the new email address for the Registrant contact. The existing registrant email address AND the new registrant email address are required to approve the change.