Zix Corporation's ZixDirectory(TM) Largest Email Encryption Network with Over Seven Million Members.

Global Directory Covers Email Recipients across Healthcare, Financial Services and Government

DALLAS -- Zix Corporation (ZixCorp([R])), (Nasdaq:ZIXI), the leader in hosted services for email encryption and e-prescribing, today announced that ZixDirectory, the core of the company's encryption service offering, hit a new milestone, now hosting the public keys for more than seven million email recipients.

"ZixDirectory is the foundation of ZixCorp's outsourced encryption service. Customers seek out our Email Encryption Service because of its ease of use and the tremendous benefits of membership in our directory," said Rick Spurr, chief executive officer for ZixCorp. "No other email encryption provider can offer its clients immediate, seamless and transparent access to over seven million members.

"Consistently securing email is the key to protecting the sensitive information that is routinely communicated in today's business environment," continued Spurr. "If users aren't diligent in protecting this information all the time, security is severely weakened. One of the biggest barriers to the consistent utilization of email encryption is that it often times is difficult for end-users to establish a connection to their intended recipients. ZixDirectory, which includes some of the most recognized companies in the U.S., eliminates this complexity by providing our customers immediate access to all members in the directory. It's a common sense approach that addresses a major obstacle to the ability to secure the transmission of sensitive information."

ZixDirectory Member Update:

Healthcare

Three of the top five healthcare insurers and half of the Blue Cross and Blue Shield plans are members of ZixDirectory. ZixCorp's health insurance customers cover over 63 million lives -- that is one in three privately-insured Americans. ZixCorp also now has over 900 hospitals as members in ZixDirectory.

Finance

The federal banking regulators (FFIEC) are members of ZixDirectory, including the recently announced Federal Deposit Insurance Corporation (FDIC). The directory also contains 12 Conference of State Banking Supervisors (CSBS) members. Having regulators sending emails to financial institutions across the country "Secured by ZixCorp" has greatly increased awareness of ZixCorp's Email Encryption Service. ZixDirectory now has over 350 financial services institutions, having added a record 85 financial institutions in the fourth quarter 2006.

As the leading email encryption provider with over seven million protected email recipients, ZixCorp's vast directory allows seamless encrypted email delivery to healthcare organizations, insurers, financial institutions and regulators. ZixCorp now supports five encrypted email delivery mechanisms, including S/MIME, TLS, OpenPGP, secure portal and "push" delivery.

About Zix Corporation

ZixCorp is the leading provider of hosted email encryption and e-prescribing services. ZixCorp's hosted Email Encryption Service provides an easy and cost-effective way to ensure customer privacy and regulatory compliance for corporate email. Its PocketScript([R]) e-prescribing service reduces costs and improves patient care by automating the prescription process between payors, doctors, and pharmacies. For more information, visit www.zixcorp.com.