Top Engineering and Manufacturing Companies Use Tumbleweed Messaging Management Solutions

Tumbleweed Messaging Management offers enterprises comprehensive set of solutions for Internet business communications

REDWOOD CITY, CA - March 19, 2001 - Tumbleweed® Communications Corp. (Nasdaq:TMWD), a leading provider of mission critical messaging solutions, announced that Freightliner LLC, Jacobs Engineering Group Inc., and John Deere have deployed Tumbleweed Messaging Management solutions to monitor and manage the email communication stream with their suppliers and partners on the Internet.

Over 45 of the leading engineering and manufacturing companies worldwide now manage online communications and enforce messaging policies with Tumbleweed Messaging Management SystemT (MMST), a set of email management products that enables these companies to protect sensitive business data on the Internet. Using MMS, these companies can set and implement policies for Internet communication, including email and browser-based communications, by applying content control, encryption, access control, attachment management, virus scanning and digital signature policies that are administered centrally and enforced universally across their enterprise.

Jacobs Manager of Global Applications Mike Mabra stated, "We implemented Tumbleweed MMS to manage our email communication stream with our employees, suppliers, and partners. We needed a comprehensive messaging management solution that was scalable and easy to install. By integrating MMS with our existing email networks, we can centrally create policies to apply content filtering, and virus and spam protection, which reduce liability and protects valuable network and system resources while remaining transparent to our end users."

"Each of our customers has built a sophisticated communications network with its customers, suppliers and business partners. Every day, important business information is being exchanged via Internet email," said Jeffrey C. Smith, Chairman and CEO, Tumbleweed Communications Corp. "Using Tumbleweed Messaging Management System, our customers will be able to protect, manage and oversee their information assets traveling over the Internet, and safeguard their enterprise from harmful content."

About Tumbleweed
Tumbleweed Communications (NASDAQ: TMWD) is a leading provider of mission critical messaging solutions that create and manage secure two-way communications channels. Tumbleweed's customers use the company's solutions to define secure communication networks, to centrally control and monitor the corporate communications stream and to create a foundation for automated preparation and secure Internet delivery of sensitive business information. Companies that rely on Tumbleweed Communications solutions include American Express, Chase Manhattan Bank, Chevron, Datek Online, the European Union's Joint Research Council, FDA, John Deere, Merrill Lynch, Nike, Northern Trust, NTT, Salomon Smith Barney, Travelers, United Parcel Service, and seven of the world's largest postal services. Tumbleweed Communications was founded in 1993 and is headquartered in Redwood City, CA.

Except for the historical information contained herein, the matters discussed in this press release may constitute forward-looking statements that involve risks and uncertainties that could cause actual results to differ materially from those projected, particularly with respect to the security features of Tumbleweed's products and the activities of any third party. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "should," "potential," "continue," "expects," "anticipates," "intends," "plans," "believes," "estimates," and similar expressions. For further cautions about the risks of investing in Tumbleweed, we refer you to the documents Tumbleweed files from time to time with the Securities and Exchange Commission, particularly Tumbleweed's Form 10-K filed March 30, 2001 and Form 10-Q filed November 13, 2001. Tumbleweed assumes no obligation to update information contained in this press release.