Executives to Convey Company Market Positioning and Growth Strategies

Redwood City, CA – July 29, 2004 – Tumbleweed® Communications Corp. (Nasdaq: TMWD), a leading provider of secure Internet messaging software for enterprises, will be presenting to security and technology investors at the 2004 RBC Capital Markets North American Technology Conference, taking place August 1-4 at the Ritz-Carlton in Half Moon Bay, CA. The conference will feature presentations by senior management from some of the biggest names in American technology, as well as panel discussions on current technology issues. The event will be attended by securities analysts, fund managers, and institutional investors. Attendance is by invitation only.

Jeff Smith, Chief Executive Officer of Tumbleweed, will present an overview of the Company’s business and product strategy. Mr. Smith’s presentation is scheduled for Wednesday, August 4th from 8:30 am to 8:55 am PDT in the Montara Room. A live audio webcast of his presentation will be broadcast at the following link: http://www.wallstreetwebcasting.com/webcast/dr23/tmwd. This link will also access a replay of the webcast approximately two minutes after the presentation ends and will be available for the following 60 days. The webcast link and replay, as well as a copy of Mr. Smith’s presentation, will be made available on Tumbleweed’s website in the investor relations section at http://www.mkr-group.com/tumbleweed/ir.html.

More event information can be found at: http://www.rbccm.com/0,,cid-17267_,00.html

About Tumbleweed Communications Corp.
Tumbleweed is a leading provider of secure Internet messaging software and hardware for enterprises and government agencies. By making Internet communications secure, reliable and automated, Tumbleweed's anti-spam email firewall, secure file transfer, secure email, and identity validation solutions help customers significantly reduce the cost of doing business. Tumbleweed products are used to communicate with millions of end-users and tens of thousands of corporations. Tumbleweed has more than 600 enterprise customers, including 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 U.S. Food and Drug Administration, and the U.S. Navy and Marine Corps. Tumbleweed Communications was founded in 1993 and is headquartered in Redwood City, California. 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 Tumbleweed's participation in the RBC Capital Markets North American Technology Conference. 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 and Form 10-Q filed May 10, 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.