Label error — DHL — Invalid postcode format

DHL label error caused by an incorrectly formatted postcode. Learn how to fix the postcode format for the destination country.

1 min readUpdated Oct 1, 2026

This error occurs when DHL cannot generate a label because the postcode does not match the expected format for the destination country.

Error message

"420506: Invalid Postcode Format"

What this means

The postcode entered in the merchant or customer address does not match DHL's required format for the selected country.

How to fix it

  1. Review the postcode in the merchant or customer address.
  2. Remove any spaces or unsupported characters if needed.
  3. Confirm the postcode format matches the destination country requirements.
  4. Save the changes.
  5. Regenerate the label.

If the issue continues

Contact support with the RMA ID and a screenshot of the error.