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Tumbleweed Extends Email Security Appliance Hardware Choices

MailGate Appliance 4500 Series Delivers High-Performance, Fault Tolerance in a Cost-Effective, Easy-to-Deploy 1U Appliance

Redwood City, CA – January 25, 2006 – Tumbleweed® Communications Corp. (NASDAQ:TMWD), a leading provider of email security, managed file transfer, and identity validation appliance and software products, today announced the availability of the MailGate® Appliance 4500 Series hardware.  The MailGate 4500 offers large appliance performance and reliability in a compact package.

The new 4500 Series appliance features a 64-bit 2.0 GHz Opteron CPU and provides fault tolerance via redundant, hot-swappable disk drives and processes up to 375,000 messages per hour.  The new appliance provides superior levels of protection from spam, viruses and other inbound content threats, while adding new onboard redundancy with dual drives and a RAID controller.  Like all MailGate appliances, the 4500 features a unique front panel LCD and controls, enabling rapid installation, network configuration, real-time status information, and appliance reset with no external cabling or monitors required.  

“Tumbleweed products are used in enterprises of all sizes, and we are always looking at how we can improve our product offerings to meet the varied challenges that our customers face,” said Joe Fisher, VP of Marketing at Tumbleweed.  “With the addition of the 4500 Series appliance to our product lineup, our mid to large enterprise customers get the best of both worlds – the small rack footprint and price point of a 1U with enterprise-class redundancy and scalability.”

About the Tumbleweed MailGate Product Suite
The Tumbleweed MailGate Suite is a family of products for protecting, filtering and monitoring corporate email.  These best-in-breed products enable businesses to manage inbound and outbound traffic, block threats, encrypt messages and optimize network performance.  MailGate products include MailGate Email Firewall™, MailGate Appliance™, MailGate Edge™ and MailGate Secure Messenger™, each optimized for specific environments and security challenges.

• MailGate Email Firewall:  A comprehensive email security offering, with functionality ranging from inbound threat prevention to outbound content filtering, monitoring and encryption.
• MailGate Appliance: A powerful and easy-to-deploy hardened Linux appliance, providing integrated network edge defense, antispam, antivirus, content filtering, policy management, and outbound encryption.
• MailGate Edge: A secure email relay appliance that delivers state-of-the-art network-based email defense against Directory Harvest (DHA) and Denial of Service (DoS) attacks.
• MailGate Secure Messenger: A policy-based, secure message delivery solution that inspects incoming and outgoing mail and dynamically applies user-defined encryption and routing preferences.

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 availability, performance and functionality of Tumbleweed’s MailGate appliances and other products.  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 16, 2005 and Form 10-Q filed November 2, 2005.

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

About Tumbleweed Communications Corp.
Tumbleweed provides security solutions for email protection, file transfers, and identity validation that allow organizations to safely conduct business over the Internet. Tumbleweed offers these solutions in three comprehensive product suites: MailGate, SecureTransport™, and Validation Authority™.  MailGate provides protection against spam, viruses, and attacks, and enables policy-based message filtering, encryption, and routing. SecureTransport enables business to safely exchange large files and transactions without proprietary software.  Validation Authority is the world-leading solution for determining the validity of digital certificates.  Tumbleweed’s enterprise and government 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 U.S. Food and Drug Administration, the U.S. Department of Defense, and all four branches of the U.S. Armed Forces. Tumbleweed 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.

Tumbleweed, MailGate, MailGate Email Firewall, MailGate Appliance, MailGate Edge, MailGate Secure Messenger, SecureTransport and Validation Authority are either registered trademarks or trademarks of Tumbleweed Communications Corp. in the United States and/or other countries.  All other trademarks are the property of their respective owners.