How do I find out if an offer is legit? Yahoo/Msn Lottery Incorporation?

发贴者 shammy | 6:15:00 AM

I have been contacted via e-mail, and informed that I have won a large amount of money. This e-mail comes from . Unfortunately, they have also asked for quite a large sum of money to ship my winnings. I'm a little leary of this offer. Can you tell me how to find out if this offer is legit?