Simple newsletter send only This is a test version of the newsletter
First, the newsletter module isn't yet stable, so I am giving you a solution for the Simplenews module.

If you want to send Views in a newsletter, you want to use the Viewsfield module. It allows you to create a Views field for your Simplenews content type. Then create a single Simplenews node and add your required View (there's a dropdown available with all active Views).

Since the content of the Views might change and you want to send the newsletter on a regular basis, you also need the Simplenews Scheduler module. It allows you to send the newsletter for example once a week with the updated content of your selected view.

I did something like that some time ago and also added a documentation on drupal.org.