I use this recipe all the time for weddings, and people love it!
1 Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 10 inch Bundt pan. Sift together the flour, baking powder and salt. Set aside.
2 In a large bowl, cream together the butter, shortening and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla. Beat in the flour mixture alternately with the milk. Pour batter into prepared pan.
3 Bake in the preheated oven for 80 to 90 minutes, or until a toothpick inserted into the center of the cake comes out clean. Let cool in pan for 10 minutes, then turn out onto a wire rack and cool completely.