Implementation of Entry Type 13 Test in ACE for U.S. Mail Processing (INT-057) and Mail Entry Type 13 Test (CBP-290) – Deploying to ACE CERT Environment on July 24, 2026 and to ACE PROD Environment on September 22, 2026

On September 22, 2026, U.S. Customs and Border Protection (CBP) will deploy the Implementation of Entry Type 13 Test in ACE for U.S. Mail Processing (INT-057) and Mail Entry Type 13 Test (CBP-290) enhancements to the Automated Commercial Environment (ACE). These enhancements implement Federal Register Notices (FRN) published by CBP on June 24, 2026 (Test of the New Electronic Informal Entry Process for Mail [ https://www.federalregister.gov/documents/2026/06/24/2026-12668/test-of-the-new-electronic-informal-entry-process-for-mail ] and Indefinite Suspension of the De Minimis Exemption for Merchandise Arriving Through All Modes Other Than the International Postal Network [ https://www.federalregister.gov/documents/2026/06/24/2026-12670/indefinite-suspension-of-the-de-minimis-exemption-for-merchandise-arriving-through-all-modes-other ]) by implementing the test of* *Entry Type 13 (ET13), a new entry type for submitting U.S. Postal Service (USPS) international mail shipment data. This update includes impacts to electronic data interchange (EDI). 
These enhancements will be available in the ACE Certification (CERT) environment on July 24, 2026, and will be deployed to the Production (PROD) environment on September 22, 2026.  
To learn more about these deployments, refer to the "Implementation of Entry Type 13 Test in ACE for U.S. Mail Processing (INT-057/CBP-290) "Trade Information Notice located here: https://www.cbp.gov/document/guidance/trade-information-notice-implementation-entry-type-13-test-ace-us-mail-processing   
CBP has published the following ACE implementation guides in support of this effort: 
 * Cargo Release   
 * Draft: ACE CATAIR Cargo Release Chapter [ https://www.cbp.gov/document/guidance/ace-cargo-release-implementation-guide-v407 ]  
 * ACE Cargo Release Condition / Error Codes [ https://www.cbp.gov/document/guidance/cargo-release-condition-error-codes ]  
 * Entry Summary  
 * Draft: ACE CATAIR Entry Summary Create/Update [ https://www.cbp.gov/document/guidance/ace-catair-entry-summary-create/update-future-capabilities ]  
 * Manifest   
 * ACE ANSI X.12 Import Truck Manifest – 309 Customs Manifest [ https://www.cbp.gov/document/technical-documentation/ace-truck-manifest-309-message ]  
 * ACE ANSI X.12 Import Truck Manifest – 355 Customs Manifest Acceptance/Rejection [ https://www.cbp.gov/document/technical-documentation/ace-truck-manifest-ansi-x12-355-message ]  
 * ACE UN/EDIFACT Import Truck Manifest – Standard Truck Manifest Customs Response Accept/Reject (CUSRES) Message [ https://www.cbp.gov/document/guidance/ace-customs-response-message ]  
 * ACE UN/EDIFACT Import Truck Manifest – Standard Truck Manifest Customs Cargo Report (CUSCAR) Message [ https://www.cbp.gov/document/guidance/standard-truck-manifest-cuscar-cargo-report-message ]  
 * ACE CAMIR – Air Import Manifest Message Line Identifiers [ https://www.cbp.gov/document/guidance/ace-air-camir-message-line-identifiers ]  
 * CATAIR Appendix   
 * ACE CATAIR Appendix B – Valid Codes [ https://www.cbp.gov/document/guidance/ace-catair-appendix-b-valid-codes ]  
CBP will update additional ACE implementation guides to support this initiative. Any future updates will be announced via CSMS.  
For questions about this deployment, contact the Cargo Release, Manifest and Export Product Division at CREM@cbp.dhs.gov or the Entry Summary, Accounts, and Revenue Division at ESAR@cbp.dhs.gov. 
For technical questions, contact your assigned Client Representative.