I've tried the "Contact Us" button here,

http://esotericsoftware.com/support

And the I get "Undelivered mail return to sender" error.

I'm assuming they are using a bad email for their contacts?!

Hi,

I see runtimes for cocos2d-x (c++),

(https://github.com/EsotericSoftware/spine-runtimes/tree/master/spine-cocos2dx)

what would I use for Cocos2d-JS (javascript) for targeting ios (not html5)? Cocos2d-js has bindings to C++ objects.

Would I need to bind the c++ to javascript, as documented here? http://www.cocos2d-x.org/wiki/How_to_bind_C++_to_Javascript

... or is there something already available?

2 given the license agreement,

http://esotericsoftware.com/support
"You may install Spine on up to 2 computers, but only for your own use. Each person using Spine must have their own Spine license."