title: How to authenticate with Google Email Settings API using service account oauth2 Python client?
body: <p>I'm using Python 2.6 and the client library for Google API which I am trying to use to get authenticated access to email settings :</p>
  
  <pre><code>f = file(SERVICE_ACCOUNT_PKCS12_FILE_PATH, 'rb')
  key = f.read()
  f.close()
  credentials = client.SignedJwtAssertionCredentials(SERVICE_ACCOUNT_EMAIL, key,      scope='https://apps-apis.google.com/a/feeds/emailsettings/2.0/', sub=user_email)
  
  http = httplib2.Http()
  http = credentials.authorize(http)
  return discovery.build('email-settings', 'v2', http=http)
  </code></pre>
  
  <p>When I execute this code , I got the follwowing error:
  UnknownApiNameOrVersion: name: email-settings  version: v2</p>
  
  <p>What's the api name and version for email settingsV2?
  Is it possible to use it with service account?
  Regards</p>