Add background images to HTML Emails in Outlook 2003
Yes it's possible, here's how - just add <img src="yourimg.gif" style="display:none;"> to the bottom of your email. Somehow this allows Outlook to figure out the image it's supposed to use for the background image. However, even though this technique works for Outlook 2003, I've not tested it on any other PC email client. This technique does not allow Mac email clients to display background images.
