Preheat oven to 325 degrees. Combine and cream the sugar, salt, baking powder, baking soda, butter, buttermilk, eggs, vanilla, and cinnamon. Slowly add the flour and mix together. Pour into greased bundt pan. Bake for 60 minutes or until a toothpick comes out clean. After baking use a fork to make a few holes on the cake. Pour the warm butter sauce over the cake. Let the cake cool before removing it from the pan.