Most would prefer a reviewer's coupon (one-time use, 100% off) from smashwords, if that is what you are sending (rather than a hand-tuned epub or other format).
That way, it's easy to redownload when you send a note that you changed something (awful formatting, accidental missing text, fixed the cover, or whatever). It's also easy to try a different format (sometimes the grinder there messes up one format, but not another).
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