Interesting ethical question!
I think it would be okay to ask if he knows how YOU can track back but, unless the offensive e-mailer actually does something that brings him into your uncle's attention officially, I would really be not ask your uncle to do something unethical (possibly even illegal).
GrimJack
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If the guy is being abusive i suppose you could report him to his ISP, or if its e.g death threats, the police.
jbennet
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