[chromeos-staging-master2.hot.corp.google.com] out: Instructions for pushing to prod are available at https://goto.google.com/autotest-to-prod 
[chromeos-staging-master2.hot.corp.google.com] out: INFO:googleapiclient.discovery:URL being requested: POST https://www.googleapis.com/gmail/v1/users/me/messages/send?alt=json
[chromeos-staging-master2.hot.corp.google.com] out: INFO:oauth2client.client:Refreshing due to a 401 (attempt 1/2)
[chromeos-staging-master2.hot.corp.google.com] out: INFO:oauth2client.client:Refreshing access_token
[chromeos-staging-master2.hot.corp.google.com] out: DEBUG:root:ending retries with error: <class 'googleapiclient.errors.HttpError'>(<HttpError 400 when requesting https://www.googleapis.com/gmail/v1/users/me/messages/send?alt=json returned "Invalid to header">)
[chromeos-staging-master2.hot.corp.google.com] out: INFO:root:Waiting for ts_mon flushing process to finish...
[chromeos-staging-master2.hot.corp.google.com] out: INFO:root:Finished waiting for ts_mon process.
[chromeos-staging-master2.hot.corp.google.com] out: Traceback (most recent call last):
[chromeos-staging-master2.hot.corp.google.com] out:   File "./site_utils/test_push.py", line 698, in <module>
[chromeos-staging-master2.hot.corp.google.com] out:     sys.exit(main())
[chromeos-staging-master2.hot.corp.google.com] out:   File "./site_utils/test_push.py", line 695, in main
[chromeos-staging-master2.hot.corp.google.com] out:     return _main(arguments)
[chromeos-staging-master2.hot.corp.google.com] out:   File "./site_utils/test_push.py", line 687, in _main
[chromeos-staging-master2.hot.corp.google.com] out:     message)
[chromeos-staging-master2.hot.corp.google.com] out:   File "./site_utils/test_push.py", line 590, in send_notification_email
[chromeos-staging-master2.hot.corp.google.com] out:     gmail_lib.send_email(','.join(email_list), title, msg)
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site_utils/gmail_lib.py", line 177, in send_email
[chromeos-staging-master2.hot.corp.google.com] out:     backoff_factor=RETRY_BACKOFF_FACTOR)
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site-packages/chromite/lib/retry_util.py", line 244, in GenericRetry
[chromeos-staging-master2.hot.corp.google.com] out:     return _run()
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site-packages/chromite/lib/retry_util.py", line 177, in _Wrapper
[chromeos-staging-master2.hot.corp.google.com] out:     ret = func(*args, **kwargs)
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site-packages/chromite/lib/retry_util.py", line 243, in _run
[chromeos-staging-master2.hot.corp.google.com] out:     return functor(*args, **kwargs)
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site_utils/gmail_lib.py", line 155, in _run
[chromeos-staging-master2.hot.corp.google.com] out:     client.send_message(m, ignore_error=False)
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site_utils/gmail_lib.py", line 121, in send_message
[chromeos-staging-master2.hot.corp.google.com] out:     userId='me', body=message.get_payload()).execute()
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site-packages/chromite/third_party/oauth2client/util.py", line 140, in positional_wrapper
[chromeos-staging-master2.hot.corp.google.com] out:     return wrapped(*args, **kwargs)
[chromeos-staging-master2.hot.corp.google.com] out:   File "/usr/local/autotest/site-packages/chromite/third_party/googleapiclient/http.py", line 838, in execute
[chromeos-staging-master2.hot.corp.google.com] out:     raise HttpError(resp, content, uri=self.uri)
[chromeos-staging-master2.hot.corp.google.com] out: googleapiclient.errors.HttpError: <HttpError 400 when requesting https://www.googleapis.com/gmail/v1/users/me/messages/send?alt=json returned "Invalid to header">


This fails an otherwise successful test_push.