Preheat the oven to 350°F. Grease and line a 9×5-inch loaf pan with parchment paper, leaving overhang on the long sides.
In a medium bowl, whisk together 1½ cups of flour, the salt, and baking powder. Set aside.
In a large bowl, whisk the melted butter and sugar together until combined. Add the eggs one at a time, whisking after each. Stir in the milk, lemon juice, lemon zest, and vanilla extract.
Add the dry ingredients to the wet ingredients and stir gently with a spatula until just combined. Do not overmix.
Toss the blueberries with one tablespoon of flour in a small bowl, then gently fold them into the batter.
Pour the batter into the prepared loaf pan and smooth the top.
Bake for 55 to 65 minutes, or until a toothpick inserted into the center comes out clean. If the top is browning too quickly, tent loosely with foil around the 40-minute mark.
Let the loaf cool in the pan for 10 minutes, then lift it out using the parchment overhang and transfer to a wire rack.
Whisk together the powdered sugar and lemon juice until smooth. Drizzle the glaze over the warm loaf and allow it to set before slicing.