Thanks pburton,
for pointing out this CSS site "
position is everything", which is really great.
I'm not sure what you actually ask about? Does your e-mail program show the web-page if I send you an link like "http://www.conficio.com" ? Such a text is usually displayed as a clickable hyper link. And if this hyperlink is replaced by the content of the web-page I'd be pissed about this (because it overpowers the rest of my message).
Or do you mean you receive E-Mails that look like a web-page immediately. This is called HTML-E-Mail and is not that new anymore. For example WebProWorld sends it's Newsletter in this format. Look at the source of such an e-mail and you can tell the difference. Sometimes an e-mail has both, plain text and HTML, to please all kinds of E-Mail User Agents (and their configuration options).
Thanks again
K<o>