The mail yourself copyright is a myth. I found this on the U.S. Copyright website:
Quote:

I’ve heard about a “poor man’s copyright.” What is it?
The practice of sending a copy of your own work to yourself is sometimes called a “poor man’s copyright.” There is no provision in the copyright law regarding any such type of protection, and it is not a substitute for registration.




Can't really help you any further, but I wouldn't use the poor man's copyright..

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