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In a medium bowl, whisk together flour, salt, cinnamon, baking powder, and baking soda.
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Set aside.
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In the bowl of an electric mixer fitted with the paddle attachment, combine butter with both sugars, and beat until light and fluffy.
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Add vanilla, milk, and eggs, and mix well.
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Add flour mixture, and beat until just combined.
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Remove bowl from the electric mixer, and stir in oats and raisins.
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Place dough in the refrigerator until firm, about 2 hours or overnight.
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Heat oven to 350°.
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Line several baking sheets with parchment paper, and set aside.
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Scoop out 2 tablespoons of dough, and shape into a ball; place on one of the prepared sheets.
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Repeat with remaining dough, spacing balls 3 inches apart.
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Press down to flatten into 2-inch diameters.
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Transfer to the oven, and bake until golden but still soft in center, 16 to 18 minutes, rotating the pans between oven shelves halfway through baking.
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Remove from oven, and place on a wire rack to cool completely.
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Store in an airtight container at room temperature up to 1 week.