If you receive an email notification to your Account email address, this is because you have either not logged into your Account recently or logged in but ignored the request to verify your account email address.
Our Account Email verification policy is to insure that every email address in our system is valid and working and monitored. This was instituted because we have had clients who did not pay attention to update their information and it resulted in them not receiving important Domain or Server renewal noticed and having to pay redemption fines to the registry or incurred the loss of their domain and website
The process should not be confused with the Domain Registrar Validation which is where the domain registrar sends notices to your domain Contact "Whois" email on file to confirm they can reach you as well. Learn more about Domain Verification Here.