Apple was Starting June 1, 2016 all apps submitted to the App Store must support IPv6-only networking.
https://developer.apple.com/news/?id=05042016a
Because the current SDK version is using the NSURLConnection, it does not support the IPv6-only network.
Therefore, the application will be rejected that are using the current SDK version.
Evernote need to develop a new version of the SDK that supports IPv6 using NSURLSession or CFNetwork APIs.