Aware of the difference in image and raw etc But the apple guys advised
me to use it before going into my Aperture 3. But again only sending
image in jpeg format and iphoto should support an jpeg image.
I think you're not telling the whole story here. Sending a jpeg formatted picture through e-mail is not in any way CPU or GPU intensive, nor even hard drive intensive, it has no reason whatsoever to be beach balling.
Either you're doing something else you're not aware of that is messing things up, or maybe, just maybe, your hard drive is bad.