iPhone Plain Text

I would like to know if there is a way I can possibly default the built in mail application on my iPhone to send emails in HTML format rather than Plain Text.

I have already read a variety of posts with some suggestions, like bolding or applying some sort of font characteristic to my email or signature would force it to use HTML. I have tried these and they do work, however the main result im looking for is something that does the same, but without having the email/signature formatted in any fashion.