If individuals want to automatically refuse foreign mail or block all mail from a specific sender, they must submit a written request to the USPS to withhold correspondence for up to two years.
1 liter = 33.8140226 US fluid ounces. 1 US fluid ounce = 0.0295735297 liters. Note that this is for fluid ounces, not dry ounces. A fluid ounce is a measure of volume, just like a liter is. A dry ounce is a measure of weight.
see OUNCE: see OUNCE: pint: p., pt. American: liquid: 0.473 liter: 1/8 gallon or 16 ounces: dry: 0.551 liter: 1/2 quart: British: either: 0.568 liter: pound: lb. dry: 453.592 grams: 16 ounces: quart: q., qt, qt. American: liquid: 0.946 liter: 1/4 gallon or 32 ounces: dry: 1.101 liters: 2 pints: British: either: 1.136 liters: teaspoon: t., tsp., tsp : either: about 5 milliliters: 1/3 tablespoon: tablespoon