If you import a picture into Word and then shrink the image down the file size of the Word document will remain the same because it's still storing the original data of the picture...the full-sized image. If you wish to reduce the size, you'd have to remove the photo from inside word, use a photo editor (such as MS Paint) to reduce the dimensions of the photo, save it, then import the shrunken image into Word for manipulation. The quality of the photo will be reduced, meaning it won't look as nice if 'expanded' to full-size, but it will cut down the file size enough to be sent via e-mail.
Hope this helps,
I have written a story and inserted 5 pictures but the file size is large to send via e-mail.
If I reduce the picture size down to 30% will the file size shrink as well or does eveything remain the same.