ORCA (The Office 365 ATP Recommended Configuration Analyzer)
Microsoft released a tool last year to run against your tenant to make sure EOP and Office 365 ATP is configured correct and follows the new best practices. This tool is called ORCA (The Office 365 ATP Recommended Configuration Analyzer).
ORCA is a project to help Office 365 tenant administrators validate their anti-spam and anti-malware settings against recommendations from Microsoft. ORCA is installed as a PowerShell module with just one cmdlet. After running Get-ORCA Report, you’ll have a report containing recommendations and observations about your configuration.
You can download the PowerShell module from here – https://www.powershellgallery.com/packages/ORCA/1.8.8
Recommended settings for EOP and Office 365 ATP security – https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/recommended-settings-for-eop-and-office365-atp?view=o365-worldwide
A must watch short 3 minutes video from my colleague Matt Soseman – https://www.youtube.com/watch?v=snhi-kgzjZk