This was the capstone on a multipart blog series so some parts in here are intentionally vague because the other sections expand on them.
Here are the others:
Automatically Revering Account Takeovers
https://www.brightball.com/articles/automatically-reversing-...
Combating Phishing with DMARC
https://www.brightball.com/articles/combatting-phishing-with...
Deploying DMARC without Breaking Everything
https://www.brightball.com/articles/deploying-dmarc-without-...
Enterprise Challenges with DMARC Deployment
https://www.brightball.com/articles/enterprise-challenges-wi...
Waste Spammers Time to Kill Their Return on Investment
https://www.brightball.com/articles/waste-spammers-time-to-r...
How Microsoft Became Phishing's Biggest Enabler
https://www.brightball.com/articles/how-microsoft-became-phi...