Swiss Post Chooses Tumbleweed IME

REDWOOD CITY, CA - April 13, 2000 - Tumbleweed® Communications Corp. (Nasdaq:TMWD), a leading provider of Internet communications services, today announced that Swiss Post, through its Yellowworld AG subsidiary, has chosen Tumbleweed Integrated Messaging Exchange™ (IME™) as the foundation for its secure online document delivery service.

Tumbleweed IME is a set of products and services that leverage the Internet and existing Email to create a secure, trackable online communication channel. Swiss Post joins some of the world's largest postal services that have already standardized on Tumbleweed IME, including Canada Post, La Poste of France and the United States Postal Service.

"Swiss Post has a clear vision of the future of communications, and has moved aggressively to standardize on Tumbleweed IME to bring to market a secure online delivery service for both businesses and individuals in Switzerland," said Jeffrey C. Smith, president and CEO, Tumbleweed Communications Corp.

About Tumbleweed Communications Corp.
Tumbleweed is a leading provider of solutions for managing secure communication and collaboration to enable the business Internet. Tumbleweed's robust policy-based framework empowers organizations to safely share and protect critical information, increase customer loyalty and privacy and dramatically reduce costs. Tumbleweed is trusted by 1,000 blue-chip customers including American Express, Chevron, Datek Online, the European Union's Joint Research Council, First Union Wachovia, John Deere, Merrill Lynch, Nike, Northern Trust, NTT, Salomon Smith Barney, Travelers and US Food and Drug Administration. One hundred of the Fortune 500 are Tumbleweed customers. Tumbleweed Communications was founded in 1993 and is headquartered in Redwood City, Calif., with offices around the world.

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.