United States Postal Service Shipping Equity Act This bill authorizes the mailing of alcoholic beverages by certain entities in accordance with the delivery requirements otherwise applicable to a privately carried shipment. The authorization applies to an entity (including a winery, brewery, beverage distilled spirits plant, or other wholesaler, distributer, importer, or retailer of alcoholic beverages) that has registered with, obtained a permit from, or obtained approval of an application from the Department of the Treasury. The bill directs the U.S. Postal Service (USPS) to prescribe regulations (1) requiring direct delivery to a duly authorized agent at a postal facility or to the addressee, who must be at least 21 years of age and present a valid, government-issued photo identification at the time of delivery; (2) prohibiting such alcoholic beverages from being for resale or any other commercial purpose; and (3) requiring such entity to certify that the mailing is not in violation of applicable laws or regulations and to provide other information as directed by the USPS. A state, local, or tribal government may bring a civil action against the USPS in U.S. district court for a violation of a law of the state, locality, or tribe regarding the sale, mailing, transportation, or importation of alcoholic beverages. The USPS shall be liable to the same extent as a private individual under like circumstances but shall not be liable for interest prior to judgment or for punitive damages.