Preheat oven to 350 Deg F (180 C) and grease and flour two loaf pans ( 9x5”) OR use parchment paper that hangs over a few inches on both longer edges.
In a medium bowl whisk together the flour, sea salt, baking soda and cinnamon.
In a large bowl mix together the mango puree, sugar, avocado oil, eggs, vanilla and rum if using it. Mix until well combined.
Add in the flour mixture and stir until moistened and only a few flour streaks remain. Do not over mix.
Divide batter between pans. Bake for 55-65 minutes or until a toothpick placed into the center comes out clean and only has a few crumbs on it.
Cool in pan 10-15 minutes then remove to a wire cooling rack and cool completely. Wrap in foil then in an airtight container. Will keep well 3-4 days at room temperature or up to 3 months frozen.