Paypal Valid Checker

Need a script written in any language for linux, that will take a list of let's say 100,000 Email addresses and check them if the are registered in PayPal or not. The script should use multi-threading or something , to check the list of emails fast. Time of checking should not be more than 1 hour for 100,000 EMAILS. The script must be able to check more than 100,000 EMails, this is just the bottom line. Script should save each time to a TXT File if they have found a valid registered email from the list. More details after bidding!