1. DHL
        DHL International GmbH (DHL) is an international courier, package delivery and express mail service, which is a division of the German logistics firm Deutsche Post. The company delivers over 1.5 billion parcels per year.
        The company was founded in San Francisco, USA, in 1969 and expanded its service throughout the world by the late 1970s.
        https://www.dhl.com/
    2. FedEx
        FedEx Corporation, formerly Federal Express Corporation and later FDX Corporation, is an American multinational delivery services company headquartered in Memphis, Tennessee.
        FedEx today is best known for its air delivery service, FedEx Express, which was one of the first major shipping companies to offer overnight delivery as a flagship service. 
        https://www.fedex.com/
    3. UPS
        United Parcel Service (UPS, stylized as ups) is an American multinational shipping & receiving and supply chain management company founded in 1907. Originally known as the American Messenger Company specializing in telegraphs, UPS has grown to become a Fortune 500 company and one of the world's largest shipping couriers.
        https://www.ups.com/
    4. USPS
        The United States Postal Service (USPS; also known as the Post Office, U.S. Mail, or Postal Service) is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, including its insular areas and associated states. It is one of the few government agencies explicitly authorized by the United States Constitution.
        https://www.usps.com
    5. TNT
        TNT Express is an international courier delivery services company. It is a subsidiary of FedEx, with its headquarters in Hoofddorp, Netherlands.
        TNT offers road and air delivery services in Europe, the region of the Asia Pacific, the Americas, the Middle East, and Africa. In June 2014, TNT conducted a rail freight trial assessing improving support to businesses in the United Kingdom, and cutting carbon emissions.
        https://www.tnt.com/
    6. EMS
        Express mail is an expedited mail delivery service for which the customer pays a premium for faster delivery. Express mail is a service for domestic and international mail, and is in most nations governed by the country's own postal administration. Since 1999, the international express delivery services are governed by the EMS Cooperative.
        https://www.ems.post/en/global-network/tracking
    7. DPEX
        DPEX is an Express and e-Commerce solutions provider with over 30 years of industry experience. “Knowing Asia Delivering Asia,”
        https://dpex.com

Content courtesy to Wikipedia