I'am trying to theme Unsubscribe Page for my Newsletter to much the Newsletter Design. Does anyone know how to theme unsubscribe page in Drupal 6:
I am going to answer this just so that people that are looking for the answer will see it.
As @AgA said:
The Themer module will give you suggested naming conventions that you can use to override that page's theme.
In your case it was the content type newsletter, coming to the suggested name of page-newsletter.tpl.php but there will be more suggestions which you can use to override an already overridden more general tpl.