do not send raw. raw is not the finished product. raw is the preprocessed image right off the sensor w/o color correction, WB, and any post processing
if you want to get the highest quality image from it send them a tiff converted from raw after processing. they are massive but a wee bit more accurate then a jpg. that is if your doing large image output. a low (as in lowest)compression jpg is good for 8x10 of average quality but not for exposition.