Here is what they sent:
Web Tools Customer,
USPS will release updates to the Web Tools APIs on 28 July 2013. The staging environment is currently open for testing your updated applications. You may review staging information and the release notes at the USPS Web Tools site here for more details. https://www.usps.com/business/web-tools-apis/welcome.htm
If you rely upon a third-party developer (e.g. software or ecommerce/cart provider) for USPS products and services on your website or your shipping application, please direct any application-specific questions to them.
For questions and concerns, please contact our customer support at 1-800-344-7779 or firstname.lastname@example.org.
Web Tools Program Office