Most fraud is carried out by people obtaining access to account numbers and passwords. Never respond to any message that asks you to send cash or personal information. You won't receive any riches, and in fact you could get into legal trouble if you become involved with one of these scams.
According to Wikipidia:
" Email spam, also known as junk email or unsolicited bulk email (UBE), is a subset of spam that involves nearly identical messages sent to numerous recipients by email. Definitions of spam usually include the aspects that email is unsolicited and sent in bulk.One subset of UBE is UCE (unsolicited commercial email). The opposite of “spam,” email which one wants, is called "ham," usually when referring to a message's automated analysis (such as Bayesian filtering).
Email spam has steadily grown since the early 1990s. Botnets, networks of virus-infected computers, are used to send about 80% of spam. Since the cost of the spam is borne mostly by the recipient,it is effectively postage due advertising"
So, one thing for sure > DO not response to this kind of emails <