The e-mail version is not the full presentation. It’s basically just the text, nicely presented by Feedburner, and links to the original content.
I sometimes post YouTube videos, photos, etc., and those will not show up in the e-mail you receive.
If the topic in the e-mail looks interesting, you might want to click the post title or the word Metaphor at the top of the e-mail. This will take you to the original blog.