New forms of phishing attacks and other advanced email threats can cost your clients—and your brand—more than you may realize.

You could call her a dream client: well-heeled, well-connected, and surely worth a fortune in potential referrals. But when a pair of business email compromise (BEC) attacks against an accountant at her wealth management firm led to $350,000 in losses, the relationship could have gone sour, fast.

Every year, more than 5 million homes are bought and sold in the U.S. Given this volume, it should come as no surprise that the real estate industry is a prime target for email-based crimes. Cyber criminals are spoofing (and in some cases taking over) the email accounts of real estate agents, title companies, and others involved in the home buying process. Once the criminal gains access, he or she then uses the information gained from the hack to dupe victims into making a fraudulent wire transfer.

One of the things that often stumps even the most security conscious companies is knowing all the third-party email service providers they are working with. It is extremely difficult, if not impossible for these organizations to protect their customers from phishing attacks if they don’t even know who is sending legitimate email on their behalf.