1.Log into your Gmail account with your username and password.
2.Open the mail.
3.To display the email headers,
■Click on the inverted triangle beside Reply. Select Show Orginal.
4.You may copy the headers and use my IP address detection script http://aruljohn.com/info/howtofindipaddress/#ipdetect to ease the process. Or if you want to manually find the IP address, proceed to 5.
5.Look for Received: from followed by the IP address between square brackets [ ].
Received: from [69.138.30.1] by web31804.mail.mud.yahoo.com6.If you find more than one Received: from patterns, select the last one.
7.Track the IP address of the sender