I'd send the full size file if they are going to print it.
2 other options are.
1. upload to a site like walmart and let them have it printed from there..
2. or a site like zenfolio..you can set your folders so people either can or can not order prints from either ezprints or mpix...
keep in mind that a 5x7 usually requires some cropping to be printed
I would either go with a 6x8 which in most cases would be full frame, or do the cropping before sending so the pic is printed the way I would want it..
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