POSTINI EXPANDS INTERNATIONAL PRESENCE WITH OPENING OF CANADIAN SALES OFFICE IN GREATER TORONTO AREA

Leading Integrated Message Management Services Company Extends Local Footprint to Growing Canadian Market

SAN CARLOS, CALIFORNIA, March 20, 2006 – Postini, the global leader in Integrated Message Management, today announced the opening of a new sales office in Canada. Located in the Toronto area, Postini’s new resources in the region will continue to support the company’s growing enterprise customer base in a wide array of vertical markets including banking, finance, retail, manufacturing, and high-tech.

The announcement underscores Postini’s commitment to global expansion, providing security, compliance, availability, and visibility solutions for corporate email and instant messaging. Currently, Postini manages 500,000 users in over 200 accounts in Canada, including 7 of the country’s largest legal firms.

“We have an established and growing base of Canadian companies that have chosen to rely on Postini’s superior managed services approach for their messaging needs,” said Kevin Wall, major account representative for Canada. “For instance a number of top-ranked legal, financial, telecommunications, and energy companies have chosen Postini because our integrated message management capabilities are designed to protect the delivery of sensitive and confidential information.”

According to David Fountain, national director of IT for Gowling Lafleur Henderson LLP, one of Canada's largest law firms, "Our goal was to reduce the volume of unwanted email traffic, provide a more secure computing environment, and reduce both the time and cost of managing our email. Postini fit the bill and works like a charm."

Postini’s expansion into the Canadian market extends the company’s footprint to additional regions that can take advantage of the benefits of its message and security threat management services for email and IM.

Other Postini customers in Canada include Bennett Jones LLP, DataMirror Corporation, Dominion Bond Rating Service, and McMillan Binch Mendelsohn LLP.

The new Canadian sales office is part of increased local support by Postini, which handles a worldwide customer base of over 35,000 businesses and 9.1 million end users, and which processes 1 billion messages per day. These customers are utilizing the managed services and Integrated Message Management capabilities from Postini to deliver the business benefits of email and IM without the associated costs, risks and complexities of in-house software or appliance products.

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. In Canada please call 905-770-9876.