overnight a letter usps

overnight a letter usps refers to sending a letter through USPS with a guaranteed delivery on the following business day. USPS offers a service called Priority Mail Express, which guarantees overnight delivery for documents and parcels, including letters. This service is the fastest option offered by USPS for mailing letters and other items, and it provides tracking, insurance, and delivery confirmation. The cost of overnight mailing depends on the weight, size, and destination of the letter.