- Your patent application is much more readable than most. That's a good start.
- hosay123 has already said basically what I would've - you may have found something that no one else has done 100% before, but it is clearly very similar to HTML in email with a few minor differences. Here are a few examples that I think would bring both the idea's novelty and non-obviousness into question: http://www.boutell.com/wusage/8.0/eml.html
http://petewarden.com/2008/10/15/an-xml-format-for-email/
https://www.google.com/patents/US7970842?dq=electronic+mail+...
My question to you is: what will happen if you are granted this patent? You've been working on this for 4 years at least, judging by the 2009 date on the application, so my main argument would simply be that you could've probably found a more interesting use for your time. It pains me to say this, since I can tell you've spent a lot of time on your application, but honestly I would feel worse if I didn't say anything.