Google has introduced machine learning to detect phishing Emails, click-time warnings for malicious links, and unintended external reply warnings. Google also launched new hosted S/MIME solution to enhance security for Gmail in the enterprise. They squared utilization of file types that convey a high potential for security risks including executable and Javascript documents. Javascript files are blocked from February 13th for security reasons. Google uses contextual intelligence which avoids from demonstrating this notice for clients that you regularly interact with. Google will also show warnings if you send Emails outside of your company domain.”]
Source: https://gbhackers.com/google-using-machine-learning-block-99-malware-phishing-mails/