A client of ours wants to send all his clients an illustrated email for Christmas (yes, I know, and I know).
I know that email HTML is a very different beast to browser HTML, and there are a lot of things to bear in mind, but I don't know the best place to get this kind of information.
Does anyone know of any good sources, or can we get a list of best practices here?
EDIT: What about mail deployment? Is it worth using something like mailchimp? Anyone?