Corvigo Anti-Spam Solution Builds Significant Momentum.

Business Editors/High-Tech Writers

MOUNTAIN VIEW, Calif.--(BUSINESS WIRE)--Sept. 22, 2003

Technology-Based Spam Solution Attracts Funding From Sequoia

Capital and Over 35 Customers Including Interwoven,

Finisar, Vitria and Holland & Hart

Corvigo, the creator of Intent-Based Filtering (IBF) for unwanted e-mail, today announced that is has grown its customer base by more than 100 percent per quarter since its launch in January 2002. Corvigo's increasing roster of customers including Interwoven (Nasdaq:IWOV), Finisar (Nasdaq:FNSR) and Vitria (Nasdaq:VITR) reflect the growing demand for MailGate(TM), the company's full service, anti-spam solution. Corvigo also announced under separate cover today that it has secured $5.5 million in Series A financing from Sequoia Capital.

Employing its "Technology vs. Technique" approach to the overwhelming corporate junk e-mail problem Corvigo has proven that its IBF technology eliminates the additional cost (people time, capital equipment and software) associated with dealing with spam. Unlike other anti-spam solutions Corvigo IBF is a patent-pending technology that does not employ the traditional anti-spam techniques, i.e., black lists, white lists, Bayesian, signatures and rules that have been proven ineffective, hard to update and expensive to maintain.

"I've tried them all," said Steve McCue, director of IT at Keker & Van Nest, LLP. "Corvigo's MailGate with IBF technology is by far the best, most intelligent solution available today."

About Intent-Based Filtering Technology -- "Technology vs. Technique"

It's technology vs. technique in the crowded world of anti-spam solutions. Corvigo employs its patent-pending IBF technology. The competition employs a series of tired, complex and hard to implement methods that do little to stop spam and take hours of IT time to manage. Rules, black lists, signatures, white lists, Corvigo doesn't use them. With Corvigo Mail Gate the IBF technology reads each e-mail to determine its intent, then routes the good e-mail to the server and sorts the questionable e-mails into junk and bulk categories. No other system is as efficient or as easy to manage.

"No other anti-spam technology can read and filter e-mail the way a human does when sorting through e-mail. Our patented technology addresses this simple concept and is already providing outstanding results to our customers. The Corvigo MailGate can be deployed in 15 minutes on any network and requires minimal IT support, making it an extremely attractive solution for enterprises of all sizes. Our customers report over 90% of junk email is being captured before ever being seen by users, without any legitimate messages being lost," said Jeff Ready, Corvigo CEO.

About Corvigo MailGate

IBF technology can be licensed and embedded in existing systems, or it can be purchased as the Corvigo MailGate with IBF technology series of solutions for the enterprise. MailGate products scale to meet the needs of small businesses to large enterprises, ISPs and even carriers. As an appliance, it takes just minutes to install and takes even less time to manage during the month. As a licensed technology, it can be built into MTAs or easily adapted to fit into any environment.

"MailGate is the most effective solution I've ever seen for stopping spam," said Brian Duran, the IT manager at Holland & Hart. "We tried several solutions including Elron Message Inspector and the GWAVA message filtering agent for Groupwise. At best Elron, dubbed one of the top solutions by InfoWorld, stopped 40 percent of our spam. The magazine obviously didn't test Corvigo's MailGate."

Corvigo MailGate Outpaces the Competition

In real world customer tests Corvigo MailGate with IBG technology has consistently outperformed the competition. With 100% quarter to quarter revenue growth in the last two fiscal quarters, the company has outperformed every other solution it has encountered in real-world, customer-driven tests.

About Corvigo

Corvigo provides e-mail filtering solutions based on its proprietary Intent-Based Filtering (IBF) technology. IBF technology uses a proprietary, patent-pending AI-based technology to reach each new e-mail message and determine the intent of the information, rather than relying on ineffective blacklists and rules. The first application of Corvigo's IBF technology is the Company's MailGate(TM), a hardware appliance that sits behind a company's firewall and in front of its e-mail server.

IBF technology is not a software or subscription-based service. It is an integrated plug-and-play technology that does not require system updates or routine maintenance to stop spam. For more information on Corvigo, and its services, please visit www.corvigo.com.