Since last Friday, a large numbers of users have been experiencing email issues because China has blocked Gmail.
GreatFire.org, a China-based freedom of speech advocacy group has stated that the Chinese government is just trying to eliminate Google’s presence in China. What Google has to consider is if Gmail users cannot get through to Chinese clients, then many people outside China might be forced to switch away from Gmail?
Google has already issued a statement that internet traffic analysis shows a huge slump in Gmail traffic since Friday and they have checked their systems. There is nothing wrong on Googles end.
This is not the first time Google has faced issues in China and Gmail has suffered. Up until the outage Friday for Gmail, protocols like IMAP, SMTP and POP3 have worked allowing users to use Gmail on phones and desktops via email clients like Outlook.
There is a current fix however the time it is available may be limited. You can use VPN to access your Gmail within China however it is getting harder to use global services like Gmail from within China.