Because security and privacy. There's a very good reason why your email client doesn't display images by default. Imagine every major email client allowed usi

Because security and privacy. There's a very good reason why your email client doesn't display images by default. Imagine every major email client allowed using HTML5/CSS3. One day somebody discovers a bug that allows you to execute random code. Now all you need to deliver a trojan to millions of people is mass-email it.