Jetpack allows you to see site statistics from within WordPress. From the dashboard, you can get a sense of what people are searching for and what pages they're looking at.
If you click the View All button (just under the graph), you'll get a much more complete view of statistics with a longer graph and additional information on referrers, search engine terms, and the most viewed posts. You can also see which links people are clicking on.
These statistics may help you assess your email efforts. If you send out an email and then see a spike in views of the posts you included, you'll know that the email found its intended recipients.