Preheat oven to 350°. In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Beat in eggs, lemon zest and juice. Combine flour, baking powder and salt; gradually stir into creamed mixture alternately with milk, beating well after each addition. , Pour into a greased 8x4-in. loaf pan. Bake until a toothpick inserted in the center comes out clean, 40-45 minutes. Cool in pan 15 minutes before removing to a wire rack. Combine glaze ingredients; immediately drizzle over bread. Serve warm.