How do I contact Yahoo? I've recieved a letter from ?Yahoo Intl Lottery Organization and I'm quite suspicious.

They claim I'm 1 of 25 persons who've won $1000000 and the money is being held in a bank in Bangkok. Addressed Dr Raynond Hisashi, vice pres. Yahoo! Lotto Org. This really smells like a scam to gain information. (Email:kaneivapro@yahoo.com.hk ) This is the contact address