Those emails are very common.
PayPal is a fraud in itself. I stopped using them as they are a scammers paradise. You have 139 pages of mumbo-jumbo to make you feel "safe and secure" but its all a disarray of loopholes designed to protect no one but PayPal.
PayPal is a money transfer service (their own words) and yet they get involved in dispute resolution. They have no business in dispute resolution.
Example: A buyer buys something on eBay. Seller ships. Buyer wants his item for free (scammer). Easy! Buyer files a SNAD with PayPal. PayPal places a hold on the funds in the sellers account. PayPal requires buyer to return item to seller and use proof of delivery via DC (delivery confirmation). Buyer sends seller an empty box with DC on it and gives PayPal the DC#. PayPal returns the funds to the buyer. Buyer now has the item and the $$. This is made even easier with PayPal's 21 day hold which "randomly" hits sellers.
PayPal has NO WAY to determine what a seller ships or a buyer returns and therefore should not be involved in dispute resolution.
PayPal is a great service for non-eBay transactions but I wouldn't use PayPal on eBay even if it meant that I never bought/sold anything on eBay at all. NO WAY.
NEVER link PayPal to your home checking account. Open a free checking account to use strictly for PayPal.
eBay owns PayPal and tried to shove Paypal down the throats of sellers by making it mandatory that a seller use an electronic paymnt method (knowing that having your own merchant account was not feesible for small sellers). They won't allow you to use Google Wallet (too much competition and they know it would plummit PayPals profits). They do allow the use of MoneyBookers, which I now use - until it becomes popular enough that the scammers start using it too.
PS - NEVER post on the PayPal (or an for that matter) forums at eBay with your seller ID.
http://forums.ebay.com/db2/forum/Paypal/97
A spoof email is the least of your worries with PayPal.
If you haven't already, I would suggest to anyone using PayPal for their eBay sales to read the "PayPal" board on the eBay Community forums. That'll wake you up in a quick hurry. These are NOT isolated cases.