We’re launching a beta program to provide admins with even more controls for advanced anti-phishing and malware protections via the advanced safety settings in Gmail. These build on the advanced protections we announced in 2018. Admins who are part of the beta will have new controls to: Place emails into a quarantine. Protect your Google Groups from inbound emails spoofing your domain. Identify emails with unusual attachment types and choose to automatically display a warning banner, send them to spam, or quarantine the messages.”]
Source: https://workspaceupdates.googleblog.com/2019/04/gmail-advanced-phishing-malware-protection-beta.html