A lottery scam.

A lottery scam is a type of advance-fee fraud that begins with an unexpected email notification, phone call, or mailing (sometimes including a large check) explaining that “You have won!” a large sum of money in a lottery. The recipient of the message—the target of the scam—is usually told to keep the notice secret, “due to a mix-up in some of the names and numbers,” and to contact a “claims agent.” After contacting the agent, the target of the scam will be asked to pay “processing fees” or “transfer charges” so that the winnings can be distributed, but will never receive any lottery payment. Many email lottery scams use the names of legitimate lottery organizations or other legitimate corporations/companies, but this does not mean the legitimate organizations are in any way involved with the scams.

There are several ways to identify the fake lottery and Reward Mails 

1. Unless someone has bought a ticket, one cannot have won a prize. There are no such things as “email” draws or any other lottery where “no tickets were sold”. This is simply another invention by the scammer to make the victims believe that they have won.
2. The scammer will ask the victims to pay a fee in advance to receive their prize. All genuine lotteries simply subtract any fees and tax from the prize. Regardless of what the scammer claims this fee is for (such as courier charges, bank charges, or various imaginary certificates), these are all fabricated by the scammer to obtain money from victims.
3. Scam lottery emails will nearly always come from free email accounts such as Outlook, Yahoo!, Hotmail, Live, MSN, Gmail etc.
4. Scam emails will often insist that the recipient keep their win confidential; this is done to avoid others advising them that the email is a scam.

Another type of lottery scam is a scam email or web page where the recipient had won a sum of money in the lottery. The recipient is instructed to contact an agent very quickly but the scammers are just using a third party company, person, email, or names to hide their true identity, in some cases offering extra prizes (such as a 7 Day/6 Night Bahamas Cruise Vacation, if the user rings within 4 minutes). After contacting the “agent”, the recipient will be asked to come to an office, where during one hour or more, the conditions of receiving the offer are revealed. For example, the prize recipient is encouraged to spend as much as 30 times the prize money in order to receive the prize itself. In other words, although the offer is in fact genuine, it is really only a discount of a few percent on an extremely expensive purchase. This type of scam is legal in many jurisdictions.

Following are the tips to Prevent or be aware of the Reward/Lottery Scam:-

1. If you didn’t enter a contest, you didn’t win — no matter what you may be told.
2. If congratulations come with a check — with instructions to deposit it and send a portion back — the check’s a fake.
3. Beware of regional rip-offs, too.