How to Find an Email Sender's IP Address in Gmail
An email message contains more the just a message. It also contains the IP address of the sender which you can then use to isolate the single computer that sent the message, or even the city it came from. Gmail is no exception to this. You just need to know where to look to find it.
Log in to you Gmail account using your username and password. Open the desired message by clicking on it.
Click the small upside-down triangle next to the word "Reply" to view the message headers.
Select "Show original" from the pop-up menu. A separate HTML document appears.
Search through the text for the phrase "Received: from." A set of brackets delineates the IP address of the sender. If there is more then one set, use the last one.For example, if you see this in the text:Received: from [126.96.36.199] by web21504.mail.mud.yahoo.com188.8.131.52 is the IP address of the sender.
If you want to trace the IP address to the city where it originated, copy and paste the address to Arul's IP address tracking program (aruljohn.com/track.pl). Then press the "Start Tracking" button. A map pointing to the city location subsequently appears.