New Delhi, Dec 11 (TIWN) Google's Gmail service went down for millions of users globally, including in India, on Saturday as most of them complained about mails not being received. The company said mitigation was underway.

“However, the Google Engineering team is now working through the backlog of undelivered messages and expect all messages to be delivered in the next few hours,” the company added.  Google, however, did not reveal the cause behind the mega global outage.