Preheat oven to 350 degrees. Grease loaf 9x5 loaf pan and line with parchment
Mix dry ingredients (flour, salt & baking powder). Set aside
In a large bowl, combine butter, sugar, eggs, lemon juice, lemon zest and vanilla until smooth.
Carefully add half the dry ingredients. Stir until combined, then add remaining half of dry ingredients. Stir in milk.
Fold in blueberries, careful not to smash them.
Pour batter into prepared pan and bake for 55 minutes or until a toothpick inserted into the center of the loaf comes out clean.
Let bread cool in pan for 10 minutes then transfer to a wire rack to cool completely.
While bread is cooling, whisk together the lemon glaze ingredients (butter, powdered sugar, vanilla and lemon juice) until smooth.
When bread has completely cooled, drizzle the glaze over the top. With any remaining lemon, zest over the top of the loaf while the glaze is still tacky.