This message explains some security improvements planned for our services. Effective March 2017 (exact date to be determined), Web Tools will discontinue support of SSLv3 for securing connections to our HTTPS APIs including all shipping label and package pickup APIs. After this change, integrations leveraging SSLv3 will fail when attempting to access the APIs.
You are receiving this message because the Web Tools UserID associated with your email address has made HTTPS requests over the past year. It is possible that no changes are necessary to retain Web Tools services and benefit from the improvements. Please review the entire message carefully and share with your web developer, software vendor or IT service provider to determine if your use of the Web Tools APIs will be affected.If you have already updated your security certificates please disregard this message. If you are not sure if any changes are necessary, please ask your IT service provider.
Background: Security research published in recent years demonstrated that SSLv3 contained weaknesses that limited its ability to protect and secure communications. These weaknesses have been addressed in the replacement for SSL, Transport Layer Security (TLS). Since then, major browser software vendors have been disabling support for SSLv3 and their work is largely complete. Consistent with our priority to protect USPS Web Tools customers, Web Tools will only support versions of the more modern TLS rather than SSLv3.
Contact us at WebTools@usps.gov with any questions or concerns.