Preheat the oven to 325°F. Grease and lightly flour a tube pan or Bundt pan or spray with nonstick baking spray; set aside.
In a large bowl, sift or whisk the flour and salt. Set aside.
In a large bowl, use an electric mixer to cream together the butter and sugar until light and fluffy, about 5-6 minutes.
Add the eggs, one at a time, mixing well after each addition. Scrape the sides and bottom of the bowl periodically.
With the mixer on low, alternately add the flour/salt and the buttermilk, starting and ending with the flour. Mix until combined. Stir in the vanilla.
Transfer the batter to the prepared pan. Gently tap it a couple of times on the counter to release any big air bubbles.
Bake the cake in the center of the oven for about 75 minutes, or until the top is browned and the sides begin to pull away from the pan. A toothpick inserted into the center should come out clean or with just a few moist crumbs.
Let the cake cool in the pan for 10 minutes, then invert on a wire rack to cool completely.