According to the Daily Dot pages, nearly 5 million accounts and passwords service Gmail was released on a Russian site that specializes in Bitcoin. List has been removed, many people believe that the information disclosed is quite old, but sources said that over 60% of passwords are still true and used. To check if your account is not leaked list, you can use this tool . You can change the password is used, enable security for Gmail 2 layers if you have not yet activated. reason you should use 2-step verification process 2-step verification, creating an additional layer of security for your Google account your ability to significantly reduce the personal information in your account are stolen. To break into an account with 2-step verification, the bad guys do not have to know the password and username that you have to have your phone. You can enable Google 2 layers of security because there easily Vietnamese tutorial:

https://support.google.com/accounts/answer/180744?hl=vi
source : google