its an american site but i think it applies
Here are key points for avoiding scam lotteries:
You cannot win a legitimate lottery if you have not entered it.
In almost all cases you must purchase a ticket to enter a legitimate lottery.
You never have to pay to collect winnings from a legitimate lottery. You pay taxes AFTER you you receive the winnings. There are no other fees.
If you hold a winning lottery ticket, you notify the lottery (they do not notify you; not by email, not by phone, not by mail).
It is illegal under U.S. federal law to play ANY foreign lottery from the United States. Many other countries have similar laws. for example, you must be a Spanish resident to play the El Gordo lottery.
Since scammers simply invent new names for their fake lottery scams, it is more accurate to say that if you do not see the lottery on the list of legitimate lotteries, it is probably a scam.
If it isn't conducted by a government or government-authorized charitable organization, it can't be a legitimate lottery
http://www.consumerfraudreporting.org/lotterie s.php