There is an existing, well-established patch email workflow which git natively supports. Using that, and extending it when necessary, would make more sense.
See git-send-email and git-am.
See git-send-email and git-am.
Emailing the entire new file every time will not work in anything but local tests as it cannot handle change conflicts. The format needs to know which parts of the file you changed, so your change does not accidentally undo other changes merged ahead of you.