Dorothy,
do you have AOL by any chance? That problem seems to happen a lot to people with AOL. Don't know why, but I had the same issue when I had it, too!
Try a coupla things next time:
- make sure to save as .jpg format, around 60% quality. That will give you a small enough file size that you shouldn't have a problem with your ISP getting mixed signals.
- and don't forget to save as a unique file name, too. That's really important.