China seems to be the access to Gmail have been blocked. The authorities did not specify a reason for the blockage. However, camps Googles services in China for quite some time with problems with accessibility.
From Google’s own Transparency Report shows that there is hardly any Gmail traffic in China. On the basis of the data seems to be the blockade since Friday to set up: since that time, the internet traffic from and to the Gmail servers have fallen sharply.
Google is already at odds with the Chinese authorities. Often, Google’s services are blocked in the firewall that China uses to access the internet to filter. Moreover, camps are also other foreign technology companies with blockages of their services. Recently became a Facebook subsidiary, Instagram is still blocked, presumably because of the protests in Hong Kong.