George got an email saying that his email account has been compromised, but it shows an old email. Leo says it's an old scam that is designed to scare him into sending the hackers money. If he's concerned, he should change his email password.
He can also go to HaveIBeenPwned.com to see if his email has been legitimately hacked. But changing the password will fix it. And while he's at it, he should turn on 2 Factor Authentication. He can simply ignore the extortion email, though.