CAKE: Preheat oven to 350 degrees. Grease and flour a Bundt pan. In a large mixing bowl, combine cake mix, water, mayonnaise, eggs and poppy seed. Beat until smooth, about 2 minutes. Pour into prepared pan and bake for 35-45 minutes or until done. Cool upright in pan for 25 minutes. Turn onto a serving plate. Prepare glaze.
GLAZE: In a mixing bowl, beat all ingredients until smooth. Drizzle over cake immediately.