How do you stop receiving unwanted e-mails in your Yahoo inbox?

Someone I know is continually receiving unwanted e-mails from a particular source. He has tried using spam as protection, but that has not worked. What other options does he have? I assume he could just close his yahoo account and open a new yahoo account, but then I believe he would lose everything that he had... show more Someone I know is continually receiving unwanted e-mails from a particular source. He has tried using spam as protection, but that has not worked. What other options does he have? I assume he could just close his yahoo account and open a new yahoo account, but then I believe he would lose everything that he had saved in the first account, which he does not seem to mind, but is there a better option?
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