Forward the email (without changing anything, not even the header) to
spoof@ebay.com. I do this with every fake looking email I receive from Ebay. That way, Ebay can keep a record of the fake emails floating around. Someone will usually email you back within a few minutes to let you know if it is legit or not. Also, you can always check the Ebay Security Center to double-check on anything that might look funky.