Im making a email template and they wanna put background images underneath the text - and to most email clients that is a no no. So i tough can you make a fallback to the clients that don't support it? Or is their a hack to make it work?
On this picture you got a list over css support
also see this link
There is a technique that is supported by all major clients: emailbg.net. The VML is a hack for Outlook which doesn't support CSS background images (except in the body tag).
You should always set a bgcolor
however as most clients load with images disabled.