In our recent email design guidelines, we recommended trying to include a good overview of the contents of your email at the top and preferably top-left of your design.
The Olive Press, by Texas based Olive Design is a perfect example of this technique. It doesn’t matter if their recipients are seeing the complete mail or just a snippet in a preview pane, listing the table of contents in this position makes it easy to decide if an email is worth opening.
The only challenge from there is ensuring your content is interesting enough to get the readers attention. Something the Olive Press clearly doesn’t have a problem doing. This is a great example for other designers on keeping your services and expertise fresh in the minds of your clients.