You would need to modify Subscribe2 plugin ([url removed, login to view]) to allow for the following:
1. HTML template option for automatic emails as well as manual
broadcasts. HTML templates should have option for header, footer and
left/right sidebar customizations.
2. Ability to save various templates and apply to manual broadcast
emails as emails are sent out
3. Preview emails before sending out in case of manual broadcasts
4. Apply 3 existing HTML templates for manual broadcasts and 1 HTML template for auto-emails from the plugin.
You need to demonstrate prior experience with WordPress to be considered for this project.