It appears that Gmail service has been partially restored in China. It was reported yesterday that the Chinese government was blocking access to the service through third-party apps, while the Gmail website has been blocked for years. While many are reporting that service has been restored, others are still experiencing delays or outages.
From the Financial Times:
The episode ended as mysteriously as it began — users of Gmail via POP and Imap servers, who had been frustrated for days trying to send and receive email, suddenly saw their inboxes full again, though some were still reporting delays in receiving emails and others said that their service had not returned.
According to Google's Transparency Report, Gmail traffic in China has experienced a small but noticeable uptick since this morning. Today's rise in traffic is the first noticeable movement since the outage began a few days ago.
Source: Financial Times