Also, if it is a REAL E-mail from eBay / PayPal, the same email will be in your "My eBay" account mail.  eBay / PayPal send messages to BOTH places ALWAYS!!!  No exceptions!!  Like the previous guide said "Do not open a link from a suspicious e-mail"  Open a new window and type in www.ebay.com yourself and then sign into your My eBay account and look to see if the real eBay sent you the same message.