Once or twice a year you’ll receive something that says:
ICANN, the Internet Corporation for Assigned Names and Numbers, requires us to ask you to review and update your details for the following domain(s):
Is this legitimate? YES.
ICANN has us send this periodically to ensure the contact information for domain owners is as current as possible. Simply login and make sure your information is up to date.
It will look something like this and list all the domains in this account. If nothing has changed with your business (same address, same phone number, and same email address) you can safely ignore this.