Mail inserts the picture in its actual size. This could cause the message to exceed limits set by your email provider. If the message size at the bottom left of the window appears in red, choose a smaller size from the pop-up menu.
People have said to me in the past that the images i send them are blurry and sometimes unreadable, but I've always put it down to their computers.
Now I know that it was apple mail all along, I feel like a but of a fool.
There is no way to turn off this compression?
now I see the size choice window at the bottom bar.