[Finnucane]

I am involved in ebook production, so I can somewhat sympathize, in that ebook reading systems tend to be way behind browsers in what code they support.

On the other hand, complex html in emails is mainly for the benefit of the businesses sending you the email, for their commercial purposes, i.e., mostly spam. It rarely has anything to do with communicating useful content to the receiver. If the email is too complex for the client, maybe it shouldn't be in the email.