Conversational Markup Language

It occurs to me that people have an annoying habit of taking things the wrong way in an email, and to combat this penchant for misunderstanding and promote a general peace among all literate people, I would like to propose a new markup language devoted to overtly clarifying the intentions of the speaker. How much more reliable would our endeavors be if we could simply bracket the phrase "I respect your opinion" with the tags <sarcasm> and </sarcasm>?

Working definitions

Irony - when the word "irony" is on the tip of your tongue, but you can't for the life of you remember it.