I concur with stedman1, it is the latest type of “fake extortion mail” doing the rounds which a lot of people are now receiving (I’ve had several over the last month or so), they try to frighten you into paying with threats and including a “hacked” password which more than likely come from a very old company breach.
Don’t click on any links and because of the nasty nature of such messages you might find your ISP or Mail provider has a link for the message header to be forwarded to them for possible action.
If the message contains a password, even if old, double check it’s not being used for any of your current logins, if so go to that site and change it immediately.
This may be of interest.
What happened when sextortion scammers targeted a BBC Trending reporter? http://www.bbc.co.uk/news/stories-46323625