DESPITE NEW SPAM LAW, POSTINI REPORTS
JUNK E-MAIL STILL PILING UP

Postini's Email Stat Track Data Indicates Spam and
Viruses Still A Threat During January 2004

REDWOOD CITY, CA, February 4, 2004 – Postini™ (www.postini.com), the industry's leading provider of email security and management for the enterprise, today announced that spam is still threatening email despite the CAN-SPAM Act that went into effect January 1, 2004. Spam accounted for approximately 79% of all email processed by Postini in January, down from 80% in December 2003. Mydoom, by far the top virus in January, was also the biggest virus outbreak Postini has processed, eclipsing even last year's Sobig.F. Postini quarantined over 12 million copies of the Mydoom virus in its first five days.

"The CAN-SPAM Act appears to have had little immediate effect on the amount of unwanted email offers," said Andrew Lochart, Director of Product Marketing. "Current Internet technology allows spammers to hide their identity, such that spam can only be fought through a combination of technology and laws."

Postini processed over 4 billion messages during January and stopped a total of 29,010,101 virus instances from entering corporate networks, an increase of 560% (29,010,101 / 5,183,577) from December 2003. According to Postini, the top ten viruses of January were:

Postini also announced that it protected customers from over 10,042,550 Directory Harvest Attacks (DHAs) in January. A DHA is an attempt by spammers to hijack and steal an enterprise's entire corporate email directory and use it to send out junk email. Postini registered over 2.1 billion (bases on an average of 216 attempts per attack) invalid delivery attempts for the month.

Postini's Email Stat Track is available to users at www.postini.com/stats and provides the most up-to-date statistics on the latest viruses, spam and DHA attacks.

Postini’s Perimeter Manager Enterprise Edition is a managed service model that protects enterprise servers and desktops at the perimeter, stopping spam and viruses before they enter the network. Perimeter Manager Enterprise Edition handles enterprise email system security and management holistically, offering spam and virus filtering, content and policy management, disaster recovery, industry specific content filtering, and protection from email attacks such as directory harvest attacks and email denial of service attacks.

About Postini
Postini, Inc. is the industry's leading provider of email security for the enterprise. Postini's flagship Perimeter Manager Enterprise Edition protects and secures the email systems of over 2,200 companies from malicious email attacks including spam, viruses, and Directory Harvest Attacks. The Postini enterprise messaging security platform guarantees 99.999% availability and provides a comprehensive set of policy-based email filtering tools and detailed real-time reports for email administrators who require the highest level of visibility and control of their email systems. Founded in 1999 and based in Redwood City, California, Postini is privately held and backed by first-tier venture capital firms. For more information, contact Postini at 866.767.8461 or visit www.postini.com.

Postini is a registered trademark of Postini, Inc.

Marty Tacktill
Public Relations Manager
650.482.3197
650.482.3109 FAX
marty@postini.com

Bryan Ferraro
Neale-May & Partners
650.328.5555 ext. 277
bferraro@nealemay.com

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