Disable the new enhanced anti-spoof capability in Office 365 ATP
Microsoft enhanced anti-spoof capabilities for Office 365. This new feature is responsible for automatic junking of a message if it fails implicit authentication. The limitation that now have is that we only can use policies to customize the actions and additionally block or allow specific senders based on their authentication status. Want to have have the ability to disable this (enhanced anti-spoofing) feature.
Can do that with some powershell:
New-AntiPhishPolicy -Name "DisableAntiSpoofEnforcement" -EnableAntiSpoofEnforcement $False
New-AntiPhishRule -Name "Disable Anti Spoof Enforcement" -AntiPhishPolicy "DisableAntiSpoofEnforcement" -Enabled $true -RecipientDomainIs "domain.com"