Sep 14th 2016, 15:16
September 14, 2016 8:16:00 AM PDT
We're investigating reports of an issue with Gmail. We will provide more information shortly.
Based on reports, it affects only Google for Work Gmail users. The users are redirected to a page with 'Service not available, contact your administrator'.
Workaround: Disable Gmail Service in Admin Console UI, save the changes, enable it back, save the changes.