You probably want to configure this such that anyone can read and subscribe but only you can post.
When I click through I get the error "You do not have permission to access this content."
I just changed the setting from 'only group members could view' to 'anyone on the web', which seems fine for this mailing list. Let me know if there are further issues.
applied to join!
We've created this mailing list you can join if you'd like to receive an email update when we make breaking changes to our API.
https://groups.google.com/forum/#!forum/lw20-api-updates