I have been using the litmus testing tool and it has been very helpful. I ran across an issue that I wanted to check out. I am trying to create css buttons with rounded corners using border-radius. I have used all of the techniques suggested on your blogs. If I send the email from our Exchange mail server the corners of the buttons are not rounded on any of the clients in the test tool but if I upload the html directly to the tool they are rounded. Seems to be an issue with our Exchange mail server stripping off the css or not supporting css3 (border-radius)? Any ideas?.