+1 Yep. I actually prefer to block an email anytime I can. A buyer's ID will block that ID only. If that same user creates another eBay account, and uses the same email, then that new ID is now unblocked. If you block the email, it will block of course the original account, and hopefully the new account if they did in fact create a new one with the same email. - This is of course my own understanding.