What is the best way to filter spam from a Yahoo e-mail account?

I don't know how my e-mail address got out, but I'm getting at least 3 pieces of mail a day from nobodies from Britain telling me I've won lotteries, asking me to help them with their finances and whatnot. The problem is I'd block them but they're always from a different address, and I'd... show more I don't know how my e-mail address got out, but I'm getting at least 3 pieces of mail a day from nobodies from Britain telling me I've won lotteries, asking me to help them with their finances and whatnot. The problem is I'd block them but they're always from a different address, and I'd only allow certain addresses to e-mail me but you never know when that will block credible, possibly important e-mail. Does anybody have any advice? Ten points for the most helpful, and thank you in advance.
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