This was just an informational letter, which is sent to gTLD and foreign ccTLD registrants in order to remind their contact information, shown by the Whois-service.
If the information is outdated, you should make changes in your personal account, because according to the paragraph 7.3 of the gTLD and foreign ccTLD Registration Agreement, submission of false information serves a ground for domain name deletion. A proper care should be taken to the specified contact e-mail addresses. These addresses are used for registrar change purposes.