Here i am explaining about g-mail but you can trace any e-mail, yo need to copy mail headers.
Now click on the pull down reply menu like the screenshot given below
Click on Show original and a new window will open
copy all the text which is written in that window
Start email TrackerPro
Click on Trace an e-mail
A new window will open soon
Paste the copied material in e-mail header window
Sometimes when you copy headers email trackerpro itself takes the headers
So no need to paste again if the header was present there
Now click on Trace
Trace will be start and after sometime you can see the results.
downloading link for email trackerpro
Guys because of some problems in blogger's hosting service all images are missing , we are trying hard to recover all.