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4C Horizontal Depot Mailboxes

4C depot mailboxes are a free-standing option for secure mail delivery. Make sure they are USPS approved before purchasing. These mailboxes can be installed indoors or outdoors as long as they follow USPS regulations. Every 4C mailbox is painted with a powdercoat finish to make them corrosion and weather resistant. 

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USPS Mailboxes

Subject to local regulations and installation requirements, our products can comply with USPS standards, as defined by the Postmaster General.

Please note that the USPS periodically updates mailbox standards and guidelines. Before proceeding with mailbox projects, we recommend you consult with your local Postmaster to comply with your specific area guidelines. US Mail Supply experts are standing by to help you navigate the product selection and installation process.

Shop all 4C mailboxes for sale online from U.S. Mail Supply.

US Mail Supply Has Quality 4C Indoor Mailboxes at Affordable Prices

US Mail Supply provides high-quality indoor depot mailboxes at affordable prices. 4C horizontal mailboxes are perfect for facilities and communities where the USPS delivers to a single, centralized location. A master commercial lock grants facility managers simultaneous access to all compartments for easy mail distribution.

4C Horizontal Indoor Mailboxes from US Mail Supply can be customized to meet the needs of buildings, including:

  • Colleges
  • Dormitories
  • Hotels
  • Financial Institutions
  • K-12 Schools
  • Military Bases
  • Private Medical Facilities
  • And more
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