US flag Official website of the Department of Homeland Security

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).

Scroll below for more information regarding the CSMS Transition.

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.

To access the CSMS archive (2011-present), please use the following link:

CSMS Archive

Once open, use the CTRL + F function to key word search for the message title or CSMS number, and then click on the message title to view the message.

Looking for an older message?

For a limited time, users can access the full legacy CSMS archive (1992-2019). For more information, please visit the legacy CSMS website.

Transition Updates


Created in the 1990s, the Cargo Systems Messaging Service, or CSMS, was developed by CBP to provide timely service messages to automated cargo systems users as well as courtesy messages on related trade processing information. Recently, due to the aging technology, the CSMS messaging service became increasingly unstable and posed a risk to CBP’s ability to send timely messaging on issues affecting the systems’ users. After looking into several options for modernizing the technology, CBP’s Trade Transformation Office identified a solution that ensures dependable service. The new technology platform provides additional benefits, such as the elimination of duplicative messages, improved messaging formats, the ability to embed hyperlinks into messages, etc. CBP transitioned to this new platform for issuing CSMS messages on July 1, 2019. Below please find additional information about the transition:

Do I need to re-subscribe and will I receive a message for each subscription group?

No. Current recipients of CSMS messages will not be required to re-subscribe as part of this transition; all existing subscriptions will be maintained.
As you know, under the current CSMS platform, subscribing to multiple groups means that users receive multiple messages. With the updated platform, users will only receive one version of the message, regardless of how many groups to which they may be subscribed.

Will the legacy CSMS page be shut down?

The legacy CSMS webpage discontinued updates on July 1, 2019. Since that time, all new messages are found through the new CSMS webpage.

On September 1, 2020, CBP will complete the full decommission of the legacy CSMS application. In preparation, CBP has created a downloadable archive of all CSMS messages and attachments issued using the legacy CSMS system from January 1992 to June 2019, which are available at the following link:

Legacy CSMS Archive Files

The legacy CSMS archive files will be available for download until September 1, 2020. If access to these files is needed after that time, users should contact their CBP Client Representative.

Be sure to visit this page and look out for additional CSMS messages for the latest information on the CSMS transition.

Will CSMS messages continue to be numbered?

Yes. Although the sequencing will be different under the new platform, CSMS messages will continue to be labeled with an associated number to assist with referencing and identification of messages.

What if I’m currently receiving SMS (text) messages?

As part of this transition, we will discontinue the use of SMS messaging to phone numbers. Please make sure you are signed up to receive all updates via email.

Be sure to visit this page and look out for additional CSMS messages for the latest information on the CSMS transition.

Last modified: 
June 4, 2020