An email can easily be traced by opening its header but this technique fails when an email is to be traced sent from gmail account as gmail hide's the sender i.p. using a 64 bit encryption.
so to trace the location of a person, we can use readnotify free service.Read Notify What is ReadNotify?
ReadNotify is the most powerful and reliable email tracking service that exists today. In short - ReadNotify tells you when email you sent gets read / re-opened / forwarded and so
Make an account at readnotify.com and compose a mail to the person you want to trace from the email id you used to create account at readnotify.com
Simply add: .readnotify.com
to the end of your recipients email address
if the email to be traced is email@example.com
then use the email firstname.lastname@example.org
in recipient's email
and then send the email as a normal mail.
the moment the receiver opens that mail, you will get all the information listed below by logging into your account at readnotify.com
Information you can get with the help of read notify-
Date and time opened
Location of recipient (per their ISP city /town)
Map of location (available on paid subscriptions)
Recipients IP address
Apparent email address of opening (if available)
Referrer details (ie; if accessed via web mail etc)
How long the email was read for
How many times your email was opened
If your email was forwarded, or opened on a different computer