I think it just another typical scam..
The Paypal Payback raffle draw conducted in December 2008, the results have just been released today. And we wish to announce to you that you have been selected as one of the lucky winners of Paypal Lottery with a Ticket No: ES-0543901X, making you the winner of the total Prize of €750,520 Euros. PayPal Lottery Prizes is a yearly Donation-based raffle draw conducted by PayPal Europe, Candidates are draw from paypal customers and credit cards holder issued by various credit cards company supporting paypal payment.
All candidates are then assign to a unique raffle tickets, Batch and references numbers ahead of the draw. Your winning number are BATCH: PP-1045-45, REF: PP-3873-ES.