Have you got that types of message of your spam box? Waring: This message may not be from whom it claims to be. Beware of following any links in it or of providing the sender with any personal information. Learn more
For the personal security purpose of gmail’s user, Google currently testing a new service which will help you to protect from phishing attacks. If gmail user opened or gmail suspecting that “it can be a phishing message” gmail automatically show you a alerts.
If you think it’s not a phishing attacks, you can direcntly report to gmail and gmail team will resolve this problem. Hope they will updates more security and I feel secure and I always like gmail.