I guess it is time again to remind everyone that large photo file sizes are not appropriate on the list.
My process is to use a program like Photoshop or Picture It to first set the picture to 72 dpi, then I resample the image to approximately 4 X 5 inches and when I save it, set the jpg compression to get down to the file size I want. Setting the dpi and the picture size lets me control the display size.
50KB or smaller is the recommended size and lots of folks get them under 40KB. If you want to send multiple pictures in the same message, please limit your total message size to 200KB.
I thought my previous messages made this pretty clear.