I am using simplenews without hindrance on one of my sites. However, I'm experiencing a strange thing on a different site. I was investigating why a seemingly small newsletter was 170kb in size (where it should be more like 30kb). I discovered in the source of the email that just about all my drupal site's css is being embedded in the head tag. My theme's css, and even some module's stylesheets.
I am quite befuddled, as the operational newsletter on the one site is doing great, and certainly not embedded stuff where it shouldn't.
Can anyone steer me in a direction?