Picasa from GoogleI use Picasa with my digital camera.
I find the simplest thing to do is resize a picture to around 800 width & preserve aspect ratio.
Then open it with Paint & save as a .jpg.
Around 100 KBs is the usual result with good quality retained.
Some start out over 2 MBs.
The more you reduce file size,the more loss of quality.
You could send them a few at a time if the file size is large.
On a dial up connection it would take a long time to download over 150 MBs worth of images.