That sourcecode looks like the newsletter was written in word or another microsoft product some email clients may not format it correctly and also depends on the browser if it supports those elements.
Here is a link if you are using css on what is supported by what email clienthttp://www.campaignmonitor.com/blog/archives/2007/04/a_guide_to_css_support_in_emai_2.html
General rule using simple tags and elements in email for best support.
Graphics may vary depending on where the newsletter ends up either their inbox, junk folder or bulk folder. Some email systems such as gmail requires that you click a link in order to display images.
I would suggest either near the top of newsletter add a link to the full version on a webpage of the newsletter. Or suggest that if images disabled ask them to enable images in their email.