Jevans to Provide Lawmakers with Details on Internet Fraud Affecting Seniors

Redwood City, CA – March 23, 2004 – Tumbleweed® Communications Corp. (NASDAQ:TMWD), a leading provider of secure Internet messaging software for enterprises, today announced that Dave Jevans, Chief Marketing Officer of Tumbleweed Communication and Chairman of the Anti-Phishing Working Group, is scheduled to testify today before the Senate Special Committee on Aging's hearing on Internet Fraud affecting Seniors. The Washington D.C hearing will focus on Internet fraud as it affects the growing "online" senior population.

Mr. Jevan’s testimony will center on the problem of Internet email spoofing fraud, better known as "phishing." His testimony will describe phishing, the growth of the problem, and how it affects consumers. Mr. Jevans will outline the activities of the industry Anti-Phishing Working Group. Tips for consumers to help them identify fraudulent emails, and methods for businesses to protect their brand identities from phishing scams, will be discussed.

About the Anti-Phishing Working Group
The Anti-Phishing Working Group (APWG) is focused on eliminating the problem of phishing and email spoofing attacks, by developing and sharing information about the problem, and promoting the visibility and adoption of industry solutions. Membership in the group is open to qualified financial institutions, corporations, law enforcement agencies, public policy groups and solution vendors.

The Web site of the Anti-Phishing Working Group is www.antiphishing.org. It serves as a public and industry resource for information about the problem of phishing and email fraud, including identification and promotion of pragmatic technical solutions that can provide immediate protection and benefits against phishing attacks. The analysis, forensics, and archival of phishing attacks to the Web site are currently powered by Tumbleweed Communications' Message Protection Lab(TM).

About Tumbleweed Communications Corp.
Tumbleweed is a leading provider of secure Internet messaging software products for enterprises, financial services organizations and government. By making Internet communications secure, reliable and automated, Tumbleweed's email firewall, secure file transfer, secure email, and identity validation solutions help customers significantly reduce the cost of doing business. Tumbleweed products are used by millions of end-users and tens of thousands of corporations. Tumbleweed customers include ABN Amro, Bank of America Securities, Catholic Healthcare West, JP Morgan Chase & Co., The Regence Group (Blue Cross/Blue Shield), St. Luke's Episcopal Healthcare System, the US Food and Drug Administration, and the US Navy and Marine Corps. Tumbleweed Communications was founded in 1993 and is headquartered in Redwood City, Calif. For additional information about Tumbleweed go to www.tumbleweed.com or call 650-216-2000.

SAFE HARBOR STATEMENT
Tumbleweed cautions that forward-looking statements contained in this press release are based on current plans and expectations, and that a number of factors could cause the actual results to differ materially from the guidance given at this time. These factors are described in the Safe Harbor statement below.

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 testimony of Mr. Jevans, as well as the nature of, and various responses to, Internet Fraud. 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 15, 2004.

Tumbleweed assumes no obligation to update information contained in this press release, including for example its guidance regarding its future performance, which represents the Company's expectations only as of the date of this release and should not be viewed as a statement about the Company's expectations after such date. Although this release may remain available on the Company's website or elsewhere, its continued availability does not indicate that the Company is reaffirming or confirming any of the information contained herein.

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