Today i checked paypal sandbox account i was not able to login. I tried forgot password link and it said that it cannot find the specified email address.
Then i tried to register a new account at paypal sandbox https://sandbox.paypal.com/ but it didn’t send me any email to my email account.
So was curious to know that what could be the problem! I tried google for this, and found out that this has happened couple of times before in past years too. May be its just another instance of the error or issue with the paypal sandbox causing problem / issue for developers for using paypal sandbox registration and login system.