Preheat your oven to 350 degrees Fahrenheit and grease a 9x5 inch loaf pan.
In a medium bowl, whisk together the flour, baking powder, and salt.
In a large bowl, cream the butter and sugar together until light and fluffy.
Beat in the eggs one at a time, then stir in the vanilla extract.
Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
Gently fold in the diced mango.
Pour the batter into the prepared pan and bake for 50 to 60 minutes, or until a toothpick inserted in the center comes out clean.
Let the cake cool in the pan for 10 minutes before transferring to a wire rack.