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We know you may have some questions about the Postal Supply, our products, or services. Here is the the place you can come to find some answers.  As we begin to receive the same questions from our customers, we will add them to our list of frequently asked questions.  If you have a question and don't see the answer on the site, then contact us using either our contact form or email your question to us at and we will try our best to get those questions answered. Check back often because we will be frequently adding more questions to this list.

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Postal Supply USPS-approved replacement parts

Postal Supply

Centralized Mailbox Systems

Centralized mail delivery provides delivery and collection services to a number of residences from a centrally located installation - whether in a single-family subdivision or multifamily complex. Business customers also receive delivery services from a convenient central location. The ability for the USPS to make multiple deliveries per stop results in faster service for customers due to less time per delivery. Fewer stops also use less fuel and produce lower carbon emissions which contribute to lower costs and good environmental stewardship.

Centralized mail delivery equipment can be in the form of any "clustered" style of mailboxes including the free-standing, pedestal-mounted cluster box unit (CBU), or other STD-4C compliant cluster mailboxes mounted in or on a wall. All centralized mail delivery equipment being serviced by the USPS must be USPS Approved. Manufacturers seeking approval must submit the mailbox product to the USPS for rigorous testing and approval prior to offering it in the marketplace.

The U.S. Postal Service will specify the mail delivery plan in new residential and commercial developments, so it is important to check with local Postal Authorities early in your project.