Please explain your exact problem - are these emails that you are receiving or sending? How is your email setup on the iPad? HTML is the markup language of the web and images are imbedded (e.g. as JPEG or GIF files), so I'm not sure what you are trying to view as described in your OP.
Hope that you can provide some more details - there are plenty of great people here to help - good luck!
When i receive emails with embedded images I e jpeg and gif. Settings set on display. I can view on my samsung galaxy and windows laptop no problem but not on ipad2. No problem with sending images. Its the receiving :-(