Check the mail's header and find out what IP it's sent from. Then check if the IP; it might belong to a proxy, or if you are lucky, it leads you directly to the f*****g b*****d and you can take action by means of contact his (99% shure it is a male) ISP.
(Then also remember that everytime you mail using Hotmail or Yahoo or... your IP is sent together with the mail.)
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unicorn
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