There are three main methods of whitelisting a sender within the spoof intelligence policy. The information in this article was gathered from Microsoft’s Use the Security & Compliance Center to create allow or block spoofed sender entries in the Tenant Allow/Block List article.
This new feature improves whitelisting phishing security tests and prevents certain errors, such as the “We could not verify the identity of the sender” error, from occurring. The improved spoof intelligence policy, now included in the Tenant Allow/Block List, looks at an email’s From address to determine if spoof intelligence should be applied.
Using Tenant Allow/Block List for Office 365