PoliteMail templates are designed using a simple grid system. The max page width is set to 640pixels, which enables the page to be printed on a standard printer, and copied into Microsoft Word for editing (with page margins reset to 0).
Ideally, graphics should be created at 100% of the intended size – in order words, you should be scaling the image up or down in Outlook. When using PoliteMail > Add Graphic Image command, PoliteMail will ask if you want it to auto-size the image for you, and if you answer Yes, PoliteMail will keep the proper aspect ratio (width/height) and auto-size the image to fit based upon the width dimension.
To create a image banner for use with PoliteMail templates, set your image to be 640 pixels wide.
PoliteMail templates are broken into page sections, with 1/2, 1/3, and 1/4 column options. PoliteMail uses a default padding width of 20px (if you want to modify this, you will have to edit the HTML code).