When filing CBP Form 5106 in pCustoms, ensuring your mailing address matches the correct postal format is crucial to avoid rejection by U.S. Customs and Border Protection (CBP). Incorrect address formatting can cause an "IMPORTER MAIL ADDRESS INVALID" error from CBP.
Prevent errors
• U.S. addresses must match USPS standards.
• Canadian addresses must follow Canada Post formatting.
• International addresses must comply with respective government postal standards.
Ensure a valid address
Verify your address using official postal service tools:
USPS address validator: tools.usps.com/zip-code-lookup
Canada Post address validators: canadapost-postescanada.ca/ac
Format correctly:
Use uppercase letters and no punctuation except hyphens in ZIP codes.
Ensure ZIP codes match the city and state.
Use standard abbreviations (e.g., STE for Suite, FL for Floor).
Correct errors and re-submit in pCustoms if CBP rejects your address.
Formatting correctly prevents errors, speeds up customs clearance, and ensures compliance. Always validate before submitting.