Case Study: Greenhill & Co. achieves stronger SPF alignment and blocks unauthorized email with Red Sift OnDMARC

Greenhill makes email trustworthy by securing their domain

Greenhill & Co., a non-profit U.S. designated visa sponsor, was challenged by the complexities of managing its SPF records and achieving DMARC compliance. With over 20 email services in use, they were exceeding the SPF lookup limit and their previous tool offered no guidance, leaving them vulnerable to phishing scams on their high-risk domain. They turned to Red SIFT and its OnDMARC product for a solution.

By implementing Red SIFT's OnDMARC platform, the team instantly gained visibility into all services sending email on their behalf, including uncovering nearly 7,000 unauthorized senders. The tool's Investigate feature allowed for instant validation of configurations, and its Dynamic SPF functionality simplified managing their lookups. This enabled them to confidently enforce a p=reject policy, which successfully blocked 68% of emails as fraudulent—over 300,000 illegitimate emails in one month—and led to a 36% reduction in unauthorized services.

Greenhill & Co.

John Shaffer

CIO