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K.T.
I hate to be the bearer of bad news but you may never find out for certain who your antagonist is. With all the concern for privacy and identity theft going on, most email organizations are extremely leery of giving out any kind of info. And as was brought up elsewhere in this thread, unless this person is using a cable modem and has a static IP address, you won't be able to track it down to the address it's coming from.
About the only way to resolve this situation is to work it from your end - ie set up a new email address or "Block Address" or something like that. I don't know of any other way you could resolve this. Maybe someone else has an idea?
That could work, say meet at a certain place to find out more or something like that, i doubt it would work and I wouldn't want to risk anybody for harm, but if they list someplace close to you, then you know that they know you guys most likely personally.
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