You might get an e-mail that says your e-mail address has won this many million (currency) because it was found “attached to some ticket”. You, however, have to keep it a secret due to “a mix-up in some names and numbers.”
These scammers use the names of real lotteries to convince you and even give the website of that lottery. Their motive is to get your personal information, namely your bank account number and they also tell you that you will have to pay a certain amount in “fees” but this part comes later on.
There is absolutely no such thing as e-mail draws or winnings where you did not buy a ticket. Watch out for these scams!