That's kinda strange.
I'm a user of okcoin and I never received such emails
okcoin.cn or okcoin.com ?
I reged both, so I am not sure from which it lekaed my email
Also I noticed under profile CN site has nick filed which by default was as my gmail... what nickname is used for and if its public I duno, but if its and its by default same as email (with no @gmail.com) its a security issue
I inspected the email a bit more,phising is genuine from google, but someone made gmail account and set as recovery options as my own email... duno what they are trying to do