Tested newsletter send- get 2 copies each time

The newsletter compose window has a text version window and an HTML window.

When I send a test to myself i get 2 copies, one with the text and one with the HTML.

Why, and how to change it?

This is so that you can make sure both versions look the way you want. The customer will get only the version they subscribe to and they can subscribe to only one version.


Thank you.