Zix Corporation Provides National Imaging Associates Inc. with Comprehensive e-Messaging Protection

NIA takes advantage of ZixCorp’s pre-configured HIPAA lexicons and automatic encryption policies

DALLAS — April 21, 2003 — Zix Corporation (ZixCorpâ„?), (Nasdaq: ZIXI), a global provider of e-messaging management and protection services, today announced that National Imaging Associates, Inc. (NIA), one of the nation’s leading providers of radiology benefits management, has chosen ZixCorp services to help enforce its company-wide email security policies.

NIA purchased ZixVPMâ„? (Zix Virtual Private Messengerâ„?) for company-wide email protection services. ZixVPM is a server-based solution that provides a high level of encryption and management for both inbound and outbound email communication. The service also includes a pre-configured lexicon that detects information mandated as Protected Health Information by

the Health Insurance Portability and Accountability Act of 1996 (HIPAA) and automatically encrypts this information to protect privacy and prevent regulatory violations.

“It was important for us to meet the April 14 HIPAA deadline for safeguarding our email communications. We were already familiar with the ease of use and high quality of ZixCorp services, as some of our clients, such as Humana, PacifiCare, MVP, and CIGNA, are already using these services,” said Krista Rector, HIPAA officer for NIA. “We wanted a solution that is invisible to our end users, but powerful enough to be able to detect potential HIPAA violations without any extraneous steps. ZixCorp’s instant interoperability and user friendliness are exactly what we were looking for. ZixCorp helps us deliver better service to our clients.”

NIA manages radiology care for over 10 million enrollees in 27 states. Company headquarters are in Hackensack, N.J., with two fully URAC-accredited operations centers in California and a brand new state-of-the-art facility in Phoenix, Ariz., making NIA’s call center capacity exceed 18 million lives. In July 2002, NIA became the first radiology management company to receive a full two-year certification in utilization management from the National Committee For Quality

Assurance (NCQA), and NIA has been accredited and re-accredited for utilization management by the American Accreditation Healthcare Commission (URAC) since 1988. NIA was also recently selected as an “early adopter” for the new NCQA Program Privacy Certification for Business Associates.

“We’re pleased to see that communication among our clients to their partners has been so positive and that ZixCorp’s reputation for excellence is spreading to the healthcare community at large,” said Daniel S. Nutkis, vice president of strategy and products for ZixCorp. “It shows that our attention to customer needs and our easy-to-use services are being readily accepted in the healthcare community. More and more healthcare companies are seeing our send-toanyone capability and seamless integration with existing email systems as the best way to meet the mandates of HIPAA regarding email.”

About National Imaging Associates, Inc.
NIA is the leading provider of diagnostic radiology management services to healthcare payors in the United States. The company offers an integrated radiology case management program that seeks to improve the total cost, quality, and utilization of diagnostic radiology services rendered to health plan enrollees. NIA was established in 1995 as a division of Corning Clinical Laboratories (now Quest Diagnostics) and was spun off in 1996 as a private company. NIA manages certain radiology care for over 10 million enrollees in 27 states. It has 275 employees. For more information, visit www.radmd.com.

About Zix Corporation
Zix Corporation (ZixCorpâ„?) is a global provider of e-messaging management and protection services. ZixCorp offers a portfolio of managed on-site and hosted e-messaging solutions to protect organizations from viruses, spam, and electronic attack, while delivering the ability to enforce corporate policies and securely send to anyone. ZixCorp’s advisory services and secure e-messaging solutions enable organizations of any size to streamline operations, avoid obsolescence, mitigate risks, and leverage the cost and time efficiencies of e-messaging. For more information, visit www.zixcorp.com.

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