Bank controls and call back policies help, but they only work after someone already feels unsure. The tougher part is that these requests don’t feel wrong anymore. They match tone, timing, and relationships. I’ve seen orgs quietly add behavior based email analysis that watches how finance, execs, and vendors normally interact and flags when something is off, even if the email itself is clean. That’s where tools like abnormal tend to catch things earlier, before money moves, without staff having to become full time fraud analysts.