For the cake:
Grease and flour a 10 to 12 cup Bundt pan, making certain all areas are covered. Preheat the oven to 345-degrees. Cream the butter on medium speed until very silky, about 3 minutes.
Slowly add the sugar, about ½ cup at a time, beating in on medium speed until light and fluffy, scraping down the sides and bottom of the bowl as needed.
Add the egg yolks, beating in one at a time.
In a separate bowl, whisk the flour together with the kosher salt and baking powder.
Stir the milk together with the vanilla and coffee extracts.
Add about ⅓ of the flour, beating into butter mixture on low speed. Pour in half of the milk, alternating with the flour, ending with the flour, blending just until the flour disappears.
Beat the egg whites and the pinch of kosher salt until stiff but not dry, about 2 to 3 minutes.
Using a large rubber spatula, gently fold the egg whites into the cake batter.
Scoop the batter into the prepared Bundt pan and bake in a 345-degree oven for 50 to 60 minutes, or until a toothpick inserted into the center comes out clean. Check at 50 minutes; take care not to overbake.
Let the cake cool in the pan on a wire rack for about 10 minutes, then carefully loosen the cake and invert on a wire rack to cool completely.
While the cake cools, make the glaze.
For the glaze:
Whisk the powdered sugar with the vanilla and coffee extracts, adding enough coffee to create a smooth glaze.
Spoon the coffee glaze over the cooled cake.