TRACE ANY EMAIL SENDER

 First you will need the full header of that email, like if you are using yahoomail then open the mail and click on action, now click on view full header to get the full header 
But if you are at gmail, ...

click on options in that mail and 

Now click on see/view original to get the header, copy header and visit this link:Trace Email,

 now paste the full header and click on trace email sender, wait for some seconds and it will give you the exact information aboout the sender.

It may failed sometimes if the user is using dynamic IP i.e. IP get changed everytime victim connects internet. So, when you get a mail and if you want to trace it, then trace that mail immediately, otherwise it may not work.