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How to tracks email senders IP

what I did so far is viewed header of the mail, sender email domain is outlook

From the header I got senders IP starts from 10.*.*.*.* somthing which private network IP, probably outlook servers IP

what I need is Email senders Original IP Address to track him/her like his public IP address.

This is very important to track him so guys any direction on this.

Just give direction on this I will research this thing as well as learn