applying markup language to emails

(tried to use <, but needed to change to [ for the sgml to show up)
[rhetorical-question]
Would email communication improve if there was some form of applying a markup language variant (SGML) that is set by the sender, but uniquely interpreted by the receiver?
[/rhetorical-question]

[statement]
Out current high level use of email to communicate has in many way negatively impacted real communication. The ability to non-verbally communicate (outside of some useless/silly varying happy face icons) is completely removed. The subtle wink, smile, change in tone, etc. are completely removed. This leaves interpretation open and up to the receiver (often predisposed) to determine and introduce their own cues.
[/statement]

[rhetorical-question]
Solution? Video? Audio? [sarcasm]Happy Faces?[/sarcasm]
[/rhetorical-question]

[statement]
What if there were some base (10-12) tags that could be inserted by the sender and uniquely interpreted by the received - even to the degree where the receiver can vary based on who the sender is [example](gee..Sue is always a kidder...raise the sarcasm indicator for anything from her...)[/example].
[/statement]

[statement]
The key to this is how the receiver implements his tags...allowing [question] tags to be italic and red, [sarcasm] tags to be blue [sarcasm](or ignored if one does not understand sarcasm)[/sarcasm], etc.
[/statement]

[question]
Anyone with a million $ to invest?
[/question]