How do I completly block one of my contacts from emailing me from my Yahoo Email?

Is there any way to do this? I want to do this for my own saftey because my classmate is ignoring me at recess and class time and then sending me nasty emails after school?
How do I completly block one of my contacts from emailing me from my Yahoo Email?
options: filters; add: put name or email in box, send to trash, save. DONe
Reply:Put this person on your "IGNORE LIST " that should do it.
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