Try Newsletter Glue on a demo site.
Free for 5 days.
Here's how it works:
1. Enter your email to start.
2. A fresh new WordPress demo site is created for you.
3. You'll be taken straight to the WordPress admin.
4. Activate Newsletter Glue and begin playing around.
5. Don't forget to create a new user account for yourself so you can easily return and login again.
