I just added this service for one domain and it seems like it is only something to prevent junk email.
"SPAM-Shield Whois Privacy: *********.COM
Expiration Date: 06/28/2005
Enter your current active e-mail address into the box below. We'll create a rotating SPAM filtered @privacypost.com e-mail account and forward any legitimate e-mails to the address you provide."
so it's NOT something like Go Daddy offers
