1. Log into your Gmail account with your username and password.2. Open the mail.3. To display the headers,* Click on More options corresponding to that thread. You should get a bunch of links.* Click on Show original4. You should get headers like this:Gmail headers : nameLook for Received: from followed by a few hostnames and an IP address between square brackets. In this case, it is 10.182.181.35That is be the IP address of the sender!5. Track the...