Preheat oven to 400°F and line a muffin tin with papers (or grease with nonstick spray).

Combine raisins and rum and let sit for at least 30 minutes, or overnight.

Sift together flours, salt, baking powder, and baking soda and set aside.

In a large bowl, cream together butter and brown sugar until fluffy, then beat in eggs.

Stir flour mixture into the sugar mixture until just moistened.

Gently stir in the milk, then stir in raisins and excess rum.

Divide batter among 12 muffin cups.

Bake at 400°F for 15 minutes. Serve immediately.