It's because most email apps block images from displaying in the email by
default, for security reasons.
Most people would see a blank email if your newsletter was a single image.
My Thunderbird, Outlook and Outlook Express don't display images in my
email.
There's often a button or header that say's something along the lines of
"Images are blocked to prevent the sender from identifying your
computer".

Take care,
Tim


"TM00" <webforumsuser@macromedia.com> wrote in message
news:ftln2p$i9a$1@forums.macromedia.com...
> word i already figured it out but thanks anyways.. but why is it
> a bad idea for the newsletter to be 1 image?