|As has been pointed out. That 10.x.x.x address is a Private Class A address and is not routable on the internet. If this is a real threat, again, contact your local police. They can trace that to it's origin if it's within USA (assuming you are as well). If it comes from outside the US, then there will be issues gettting said information.|
The email address of the sender wasn't in that header. The best you could hope for from an email header is to find out who the ISP of the sender is. But without a court order, that ISP isn't going to give the information on who their client is to you, me, or anybody else.........period, full stop. This is why contacting your local police has been recommended several times.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.