The unspecified technical problem, could affect Google's pitch to corporate customers, the Wall St Journal reported.
Google's last update to the problem log said Gmail access had been restored for some users.
9/15/16, 10:20 AM
Gmail service has already been restored for some users, and we expect a resolution for all users in the near future. Please note this time frame is an estimate and may change.
Delivery of messages sent to affected users during the issue may be delayed.
Following the initial reports, the firm revealed it had launched an investigation, and directed users to its Apps Status Dashboard for any updates.
Of the reported outages, 50 per cent were problems accessing email, 25 per cent were with the website and another 25 per cent were error messages
As a suggested solution, the company recommended disabling Gmail Service in user's Admin Console UI, saving the changes, turning it back on and saving the changes again.
'I can confirm switching email off then on again for the whole domain solved the issue for us too,' one Twitter user said. 'Thanks & good luck.'
Some Twitter users poked fun at the outage online.
