united states post office overnight mail

united states post office overnight mail is officially known as Priority Mail Express, the fastest USPS domestic service. It guarantees next-day delivery to most U.S. addresses, including weekends and holidays, for an additional fee. This service includes tracking, $100 insurance, and signature confirmation. It’s ideal for legal documents, perishable goods, or emergency shipments. While more expensive than other USPS options, it remains a cost-effective solution compared to private carriers for urgent domestic delivery needs. Many small businesses use overnight mail for premium customer service.