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  2. Trade
  3. ACE and Automated Systems
  4. Cargo Systems Messaging Service

Cargo Systems Messaging Service

Welcome to U.S. Customs and Border Protection’s (CBP’s) Cargo Systems Messaging Service (CSMS). CSMS is one of CBP’s methods for communicating to our trade partners news and updates on our automated systems – namely the Automated Commercial Environment (ACE). To receive the CSMS messages via email, please register below.

Register for CSMS Messages


View Recent CSMS Messages

To search for a message title or number on this page, use the find function. Press CTRL + F and start typing your keywords. A search bar will appear at the top of the screen displaying your search terms. This will search message titles on the entire page.

These documents may qualify as a “guidance document” as set forth in Executive Order 13891 and interpretations thereof; such guidance documents are not binding and lack the force and effect of law, except as authorized by law or as incorporated into a contract. These documents are being posted to this portal to provide stakeholders with useful information.


View Archived CSMS Messages

Last Modified: Jan 08, 2024