This is a bunch of noise. If I'm reading the past posts of yours correctly, this person is sending these to your current wife and these children are your stepchildren?

If so, this is not your problem. Your wife needs to take all this to court. Also, why does she not have primary custody?

Edit: Actually I'm reading further, are you two not married yet? I guess my question again is why doesn't she have custody of her children and she should be talking to her attorney about the children being punished with these emails as documentation.