When you enable WhoisGuard service for a domain, it puts its address information to the public Whois instead of yours to protect you from potential spam and even identity theft.

Your personal email address will be replaced with a unique WhoisGuard one (e.g., 97380ca054414a9387fe517f34b6037d.protect@whoisguard.com), and every email sent to this WhoisGuard email address will be forwarded to an email address of yours.