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Tumbleweed Announces Availability of AS2 Engine for SecureTransport

AS2 Engine Expands Customer Connectivity and Simplifies Management of File Transfers

Redwood City, CA – June 21, 2004 – Tumbleweed® Communications Corp. (NASDAQ:TMWD), a leading provider of secure Internet messaging software and appliances for enterprises and government agencies, today announced the availability of its SecureTransport AS2 Engine for secure data exchange over the Internet with customers and partners. This new capability extends SecureTransport’s support for multiple file and data exchange protocols, giving enterprises a single platform for both EDI and non-EDI file transfers, thereby reducing operational cost and complexity.

The new AS2 Engine expands SecureTransport’s ability to work with multiple file transfer clients and protocols by adding support for the increasingly popular EDIINT AS2 standard, providing secure and reliable data exchange with any AS2-certified solution. This allows companies to migrate partners and customers from expensive EDI VANs and async/bisync dial-up connections, to a low cost Internet-based enhanced file transfer solution with comprehensive security, management and reporting. To facilitate tighter integration of AS2 transfers with back-end applications, SecureTransport’s event-driven agent framework provides a powerful capability for rules-based pre- and post-processing all file transfers. The AS2 Engine is interoperable with the reference AS2 products in the Drummond Group's eBusinessReady™ program, with full certification expected by October 2004.

AS2 is a broadly accepted communication protocol used to transport EDI transactions and other electronic documents over the Internet. It supports a secure and reliable exchange of data with trading partners over the Internet with confidentiality, authenticity and non-repudiation, while generating significant cost savings by replacing costly VANs and private networks. AS2 also provides plug-and-play connectivity with the supply chain systems of leading retailers, consumer packaged goods vendors, and automotive companies, as well as Internet on-ramps of many EDI VANs.

“The AS2 Engine for SecureTransport expands connectivity choices, making it easier to match communication channels with partners and customers, based on their technical skill level and business needs” said Dave Jevans, Chief Marketing Officer for Tumbleweed Communications. “By consolidating multiple file transfer capabilities on a single integrated platform, SecureTransport lowers operational costs and simplifies the management of file transfers.”

About Tumbleweed SecureTransport
Tumbleweed SecureTransport is an award-winning enterprise-class secure file transfer product for moving financial transactions, critical business files, large documents, XML, and EDI transactions over the Internet and private IP networks. SecureTransport recently won the 2004 “Best Communications Security” award from the prestigious Secure Computing (SC) magazine. The product has also been ranked as a market leader in META Group's METAspectrum(SM) for Enhanced File Transfer, with Tumbleweed specifically recognized for solid technology and customer support, and strengths in vision, personnel, price, agility, and market presence. SecureTransport is currently in use at 8 of the top 10 US banks, as well as numerous insurers and financial networks. The product has been deployed at over 20,000 corporate sites around the world and is used to move billions of dollars in payment transactions daily.

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 the certification of the AS2 Engine, as well as the features and performance of the SecureTransport product. 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.

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