We often receive requests for intercom systems that allow postal employees to use a key to enter multi-tenant buildings, such as apartment complexes and condominiums. Fortunately, there are a couple of ways this can be accomplished using the same USPS access key, commonly referred to as the USPS arrow key, which mail carriers carry.
Method 1: Lockbox with Building Key
The United States Postal Service prohibits carriers from accepting keys for private mail receptacles, buildings, or offices unless an electromechanical door lock system or key keeper box is used.
Rather than an intercom with a key lock, the solution here is to install a USPS key keeper box near the intercom or door. This box is specifically designed for USPS use. The Postal Service provides its own “master access lock,” which mail carriers use to access the key keeper. These locks are government-owned and are not available for purchase by developers or property owners. To obtain a USPS lock, you will need to contact your local post office or speak directly with your mail carrier to arrange the installation. IntercomsOnline CANNOT provide one since they are government owned.
In this scenario, the mail carrier uses their USPS arrow key to open the lockbox, retrieves the building key, unlocks the door, and then returns the key to the lockbox after delivering the mail.
Alternatively, the lockbox can be equipped with a button that, when pressed by the mail carrier, activates the electric door strike, granting them access to the building without needing to handle a physical key.
Method 2: Electric Lock Activation via USPS Key Lock
Another option involves integrating the USPS-provided lock with an electric switch. When the mail carrier turns the lock, it activates a switch that triggers the doors’s electric door strike. This setup allows for easy access without the need for a separate building key.
In this case, the switch connects via two wires to the electric door strike. If you already have an intercom system installed, these wires can be connected at the same point for seamless integration.

Custom-Made Solutions
We offer custom-made door panels that are designed to accommodate the USPS arrow key lock. These panels can be tailored to your specific needs and building configuration. For more information, please visit our custom made page: Custom Made Intercom Panels

Custom Made Cell Intercoms

- Outside dimensions of the door panel
- Is it surface mount or flush mount?
- Apartment name engraved on the panel?


Copyright IntercomsOnline.com. All Rights Reserved.