How To Trace Emails - From Yahoo To Gmail

Hi folks in this video i am going to give you the video presentation on how to tracing the emails.

But there is a minor flaw. It is that it works when and only when if some one sends you mail from his yahoo account and you receive that mail in your gmail account.

From Gmail To yahoo - Doesnt Work
From Yahoo To Gmail - Doesnt Work
From Yahoo to Yahoo - Doesnt Work
From Gmail To Gmail - Doesnt Work
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From Yahoo to Gmail - Works Pefectly

I am finding the patch for above flaws. If you have the solution kindly post in comment. Appreciating in Advance.