POSTINI WINS INFO SECURITY PRODUCTS GUIDE HOT COMPANY 2006 AWARD; AWARD RECOGNIZES THE COMPANY’S COMMITMENT TO INTEGRATED MESSAGE MANAGEMENT FOR ENTERPRISES

Postini Perimeter Manager Service Awarded for Its IM and Email Protection

SAN CARLOS, CA, March 1, 2006 — Postini, the global leader in Integrated Message Management, today announced it has won the Info Security Products Guide “Hot Companies 2006” award, based on an industry analysis of more than 600 security companies worldwide. Postini is the first and only enterprise-class managed service to provide a complete and integrated set of compliance, security, availability, and visibility solutions for corporate email and instant messaging. Postini's services help companies protect, archive, encrypt and manage their email and IM, based on company policies.

“Postini is honored to have been selected as an Info Security Hot Company for 2006. This award underscores our dedication to our customers and to providing an integrated way for them to seamlessly consolidate the management of their security and messaging needs onto a single platform,” said Quentin Gallivan, president and CEO at Postini. “More than 35,000 businesses around the world rely on Postini Integrated Message Management. We are committed to offering the most comprehensive security and compliance solutions to them.”

Winners of the Info Security Hot Companies award are selected based upon an analysis of information security vendors around the world. The award looks at the products, people, performance, and potential behind a company's growth and success. In addition, the awards program helps raise the bar significantly for the industry to provide end-users with effective and deployable protective solutions against the next generation of highly sophisticated and blended attacks.

About Info Security Products Guide Awards
The Info Security Products Guide plays a vital role in keeping end-users informed of the choices they can make when it comes to protecting their digital resources. It is written expressly for those who are adamant on staying informed of security threats and the preventive measure they can take. You will discover a wealth of information in this guide, including award winning case studies and deployment scenarios, people and technologies shaping info security and the best selling products. The Info Security Products Guide Awards recognize and honor excellence in all areas of information security. To learn more, visit http://www.infosecurityproductsguide.com and stay secured.

About Postini
Postini is the global leader in Integrated Message Management, providing compliance, security, availability, and visibility solutions for corporate email and instant messaging. Postini offers a complete suite of services including message archiving and discovery, spam and virus blocking, and messaging continuity. The company’s powerful managed services infrastructure seamlessly integrates with customers’ infrastructure, providing uncompromising security for more companies than any other provider in the world. Postini’s services protect organizations from a wide range of threats, reduce compliance and legal risks, ensure reliable communications, and enable the intelligent management and enforcement of enterprise policies that protect companies’ intellectual property, reputations and business relationships. For more information contact Postini at 866-767-8461, or visit http://www.postini.com.