What is the most effective way to block spam mail on Mac Mail?

Ana: What is the most effective way to block spam mail on Mac Mail?
I use Mac OS Mail, redirecting Yahoo! Mail to it.
What’s the most effective way to block spam? I seem to be getting upwards of 50 spam messages a day.

Answers and Views:

Answer by Jack
Spammers seem to know how to bypass spam filters these days, you can’t block it. You need to make a new account and heed the following.

You get spam when your address is published on the internet, on any social networking pages you may have or on guestbooks, anywhere really. Spammers use bots to harvest those addresses and then send the same emails to thousands of people at once.

Prevention is the answer, make a new account and keep the address off the internet and you won’t get spam.