Switching From a Non-Feedburner Feed to a Feedburner One?
In that case, it’s definitely a good idea to manually review your Blog Broadcasts, at least at first, for the same reason as above — when you change your feed URL, Blog Broadcaster will think it’s an entirely new feed, with new posts, that all need to be emailed. Manually review your feed until Blog Broadcaster has read your previous posts and created emails for them (which you can just delete). After that, feel free to switch your preferences to send automatically.