Scam or True..!

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Friends past week i've received a mail telling me that i'm the winner of Emirates Internetional lottery which held for yahoo and their were twenty winners and i was one of them winning 420000 Pounds and that mail didn't seem like scam. But than i did a mistake of sending my details to them for claiming the amount as they requested in that mail. Then after two days they sent another mail tellin me that my claim is being accepted and i'l receive the amount through Unity Trust International bank soon and they sent me a certificate of garrantee of payment through that bank and it will take the transfer the amount to my local bank. Then again after two days i received one more mail sending me the picture of cheque which they deposited in that bank(UTI). And today one more mail tellin me that transaction is under process and i'l receive that amount within stipulated time.......... I Can't Figure this thing out.......!