If you are using a PoliteMail template and images are not scaling while the text and table are, you can use the mo_re100% fix that allows the images to scale with text and table.
To fix, add mo_re100% without quotes to the alt text of the image. Right click the image and click format picture.
This instructs PoliteMail to change the image height to “auto” and the width to “100%” during sending (something you can’t do in Outlook). The effect is that the images will scale with the table they are inserted in.