On Tuesday 04 February 2020, at 09:30 (am) Mountain Time, acceptance of requests using TLS versions 1.0 and 1.1 will be disabled. They will remain disabled until 11:30 (am) Mountain time of the same day, for a total of two hours.

If you are unsure whether your application and traffic will be affected, please point your application to our test tool:
https://test-tls.api.smartystreets.com/

For more information, see the following blog post:
https://smartystreets.com/blog/2019/10/removing-old-versions-of-tls