I am getting unwanted e:mails mostly lottery scams and other awards (all fraud).How can L stop them?

i am getting e:mails declaring myself winner of huge sum in free lotto.UCON- 2007 LOTTERY, MSN/YAHOO/WINDOWS and MSN- ILO lottery. Beside beneficiery of will of huge amount. All of these scam as they demand money in the name of courier forwarding and insurance coverage. I have checked on internet. jitendra dutt