In my email views, I usually just do something like...
- Name
- Value
Should
Many of the posts on this thread are rather old, and as a result they are no longer accurate.
These days HTML emails should include a doctype, html and body declaration if you intend to do anything fancy at all.
There are a multitude of guides on this subject which can help you learn how to properly code HTML Email, but most of them disregard the specifics of a doctype, which is how I stumbled on your question.
I suggest you read the following 2 posts which are from reputable teams familiar with the various problems:
campaign monitor's take
email on acid's take