In large bowl, beat butter with sugar until light, fluffy and pale yellow, about 5 minutes. Add 1 egg; beat for 2 minutes, scraping down side. Repeat with remaining eggs, adding 1 at a time. Beat in milk, vanilla and salt until combined (mixture may appear curdled).
Add half of the flour; stir gently just until combined. Repeat with remaining flour. Scrape into parchment paper–line 8- x 4-inch (1.5 L) loaf pan, smoothing top.
Bake in 325°F (160°C) oven until top is golden and cake tester inserted in centre comes out clean, about 1 ¼ hours. Let cool in pan for 20 minutes. Turn out onto rack; let cool completely. Peel off parchment paper. (Make-ahead: Wrap in plastic wrap; store for up to 2 days.)
