" Reminder: Update Your Domain Whois Info" and "Important Notice Regarding Your Domain Name(s)" are legitimate emails from Namecheap.com. These emails are simply a reminder to make sure your contact info is up-to-date.

Such notifications are sent from the <donotreply@name-services.com> email, which is also legitimate.

If the contact information for your domain(s) needs an update,  please do it in your Namecheap account.