Not all delivery locations are suitable for every shipping workflow. USPS GoPost addresses—automated parcel locker locations operated by USPS—can pose limitations for businesses whose carriers, package sizes, service levels, or fulfillment processes are not compatible with locker-based delivery. USPS GoPost Address Validation helps merchants avoid these challenges by preventing unsupported GoPost addresses at checkout.
Why USPS GoPost Address Validation Matters
USPS GoPost locations are designed for secure, self-service parcel pickup. However, they often come with restrictions such as size limits, service compatibility constraints, and carrier-specific requirements. If your business cannot fulfill orders to these locations, accepting them can result in:
Failed or rejected deliveries
Returned shipments due to locker incompatibility
Delays caused by rerouting or address corrections
By identifying GoPost addresses early, businesses can prevent these issues before the order is processed.
How USPS GoPost Address Validation Works
When enabled, the USPS GoPost rule automatically checks delivery addresses entered during checkout. If the address is recognized as a USPS GoPost location, the rule is triggered and the customer is notified that delivery to this address is not supported.
Valider leverages a world-class database and collaborates with industry-leading address validation providers, including USPS, FedEx, DHL, and other trusted shipping partners, to ensure the address is verified with the highest level of accuracy and reliability.

Key Features
Universal Rule Execution
The rule applies automatically to all checkouts without the need for additional conditions, making it simple to enable and manage.
Inline Error Messaging
Error messages can be displayed directly below the address input field, clearly indicating the issue at the point of entry. This helps customers quickly understand why their address cannot be accepted.
Custom Error Messaging
Merchants can customize the message shown to customers, such as:
“We cannot deliver to a USPS GoPost address.”
Clear, branded messaging reduces confusion and sets proper delivery expectations.

Conclusion
USPS GoPost addresses can introduce fulfillment challenges when they fall outside your supported delivery options. By enabling USPS GoPost Address Validation, businesses can proactively prevent delivery failures, reduce operational overhead, and ensure a smoother checkout experience. This rule helps guarantee that only serviceable addresses move forward—protecting both your logistics operations and customer satisfaction.
Should you have any further questions, please feel free to drop an email to support@valider.app.
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