Case Study: NTT DATA Group achieves global protection of 6.5 million emails a day with Proofpoint Email Protection

NTT Data Corporation Relies on Proofpoint to Protect 6.5 Million Emails a Day

NTT DATA Group Corporation, a Tokyo‑headquartered global IT and business services firm, needed to strengthen email security and unify disparate overseas domains as it expanded through acquisitions. The company faced escalating targeted email threats, inconsistent address domains that eroded brand recognition, and the challenge of protecting users across multiple Microsoft 365 tenants while handling millions of messages daily.

NTT DATA deployed Proofpoint Email Protection, Targeted Attack Protection (TAP), Threat Response Auto‑Pull and Proofpoint Zen to convert outbound addresses at the gateway, present a unified nttdata.com brand, and implement a two‑layer global and OpCo‑level defense. The solution improved detection and incident response, reduced suspicious emails seen by employees, streamlined phishing training and reporting, and stabilized domain and security measures for roughly 6.5 million emails a day.

NTT Data

Sotaro Hamada

Senior Manager, DX Office/System Development Group