It is really interesting to trace a gmail sender especially when you are curious about that person. Following is step by step Guide to DO IT.
1: Log into your account and open the mail.
2: Click on More option.
3: Click on “show originals”.
4: now a new Window would have appeared in it search for something like Check the first line “Received from xxxxx.xxxx.net” ip=XXX.XXX.XXX.XX″
5: Now here the IP is the IP address that you can search in samspade.org or in any other IP tracing Site.