Allow users to set up google 2-Step verification

Prevent spam, spoofing & phishing with Gmail authentication and MTA Strict Transport Security (MTA-STS) for your domain

Set up SPF, DKIM , DMARC and MTA-STS for your organization

Use Googles data loss prevention (DLP) to scan Google Drive file sharing and prevent data loss.

Using data loss prevention (DLP), you can create and apply rules to control the content that users can share in Google Drive files outside the organisation. DLP gives you control over what users can share, and prevents unintended exposure of sensitive information such as credit card numbers or identity numbers.