Preheat oven to 350 degrees.
Butter and flour two 9-inch by 5-inch loaf pans.
In an electric mixer, cream butter and sugar. Add eggs one at a time, beating well after each addition.
Add lemon rind.
Combine flour, salt and baking powder. Mix into creamed mixture alternately with milk.
Transfer to prepared pan.
Bake 40-45 minutes.
Prick holes in top of hot loaf and pour glaze over. Cool 10 minutes in pan.
Unmold on platter.