If you got this "Ebay Unpaid Item Strike Received" in the email, don't click any where in the page. Just copy and paste the no. to ebay to see if it real.
It's a "spoof" mail.
I check the eBay "My Messages" on the eBay website - if it is a legitimate message from eBay it will be there as well - anything I get in my email that's not in my eBay "My Messages" get's sent to their spoof addy.
I get so many of those damn things from ebay and paypal now that there is nothing the real ebay or paypal could send me that I would believe. Sometimes the fake ones even have your real name.