Comment 2 for bug 1036207

Difficult to say what the cause of this could be (I could not reproduce the problem on my local machine...).

Did you take a look at mailman.log? "list.held"-requests should appear like this:

GET /<email address hidden>/held HTTP/1.1" 200

If the status is 200 there is probably something wrong inside mailman.client or httplib2.

For debugging you could also try to make the http request to the api directly without using mailman.client. It's a bit complicated from the shell though, because you have to add the auth header to the request (I'd recommend using the "requests" library for this... Makes http calls pretty painless.).