Press Release

AMLAW TECH SURVEY IDENTIFIES POSTINI AS TOP SOLUTION IN USE BY LAW FIRMS TO STOP SPAM

Market Share of Postini Customers Nearly Doubles in Poll of Law IT Chiefs

REDWOOD CITY, CA, October 12, 2004 — Postini, the leading provider of email security and management for the enterprise, today announced that it ranked as the leading antispam solution in a survey of IT executives at top law firms. In an annual poll conducted by American Lawyer Media's AmLaw Tech magazine, 36 percent of companies use Postini to block spam, nearly doubling Postini's market share since last year. More survey respondents use Postini than the next five ranking vendor solutions combined.

Postini's managed service is identified in the follow-on report by AmLaw Tech as "running away with the antispam space". The survey, which examines top technology trends, issues, and vendors for the legal arena, takes the pulse of IT executives in a special report entitled "The American Lawyer's Technology Supplement."

"The findings of the poll are consistent with the growth and penetration we've experienced within the law and professional services industries, along with other major vertical markets," said Shinya Akamine, president and CEO of Postini. "Email and network security are of paramount importance to the legal profession, and we're addressing the needs of a critical mass of law firms that are selecting Postini for comprehensive and easy-to-use methods of intrusion prevention."

Postini has seen rapid growth in its customer base in the legal profession, with over 400 law customers, an increase of over 150 percent in the last year. Postini's law customers include companies such as Baker & McKenzie, Foley & Lardner LLP, Ropes & Gray, Holland & Knight LLP, Morrison & Foerster LLP, and Fenwick & West LLP and many others that are utilizing Postini's Perimeter Manager to eliminate spam issues that have previously plagued email systems and user inboxes.

About Postini
Postini, Inc. is the leading provider of email security and management services that protect email infrastructure by preventing spam and attacks from reaching the enterprise gateway. Postini's patented managed services model utilizes exclusive preEMPT™ transport and content filtering technology to eliminate spam and viruses, stop DoS and directory harvest attacks, safeguard content, and improve email performance. Founded in 1999, Postini processes more than 2.4 billion message connections every week for more than 3,800 companies. By blocking spam, viruses and attacks before they can reach the enterprise email gateway, Postini Perimeter Manager is designed to assure complete email security while saving bandwidth, conserving server capacity and minimizing administrative costs. For more information contact Postini at its Redwood City, California headquarters toll-free at 866.767.8461, or visit www.postini.com.

Postini is a registered trademark of Postini, Inc.

Marty Tacktill
Senior Director, Worldwide Public Relations
650.482.3197
650.482.3109 FAX
marty@postini.com

Kimberly Canedo
Neale-May & Partners
650.328.5555 ext. 278
kcanedo@nealemay.com