These extra
" { and } " brackets that you're seeing are used to remove text when you post the bulletin to a forum. They are also removed when the bulletin is emailed. Example. The script generates each users info, like posts, last time the user visited ... These brackets surround the user info so when the bulletin is posted to a forum the user information is removed. If you remove the brackets then the post in the forum will show the users stats from the user generating the email. It also removes the news articles sections when you post to a forum. There is no reason to maintain multiple copies of the news information.
These brackets are also explained in the "Preview Email" section under the Community Bulletin Generator.