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Tumbleweed Unleashes MailGate AntiSpam Appliance on the Enterprise; Latest Version Combines Support for Multi-Appliance, High Availability Deployment With Simple, Centralized Management

Redwood City, CA – June 28, 2005 –   Tumbleweed® Communications Corp. (Nasdaq:TMWD), a leading provider of email and file transfer security solutions, today announced the release of MailGate AntiSpam Appliance 2.5, the latest version of Tumbleweed's award-winning Linux-based security solution.  MailGate AntiSpam provides state-of-the-art protection from spam, viruses and other inbound threats through a simple, hardened appliance.

This latest release supports high-availability deployment of multiple cooperating appliances, including automated load balancing, centralized quarantine queues, single sign-on to all of the appliances in the cluster, and shared configuration data.

Unlike competing email security solutions, customers don't need to purchase an expensive dedicated server for clustered administration.  Multi-server deployments are instead managed via Enterprise Manager, a simple-to-use, centralized administration interface running directly on any one of the live primary appliances.  Benefits to this approach include:

• Scalable inbound email security -- there is no limit to the number of appliances that can participate in a cluster across an extended enterprise
• Reduced operational TCO due to single point-of-administration leveraging shared configuration, policy and queues
• Reduced solution TCO as no dedicated administration servers are required

The volume and complexity of malicious email traffic continues to grow at an alarming rate, and, with it, the requirement for increasingly powerful, flexible security solutions.  Organizations -- particularly large enterprises -- are faced with the challenge of regularly improving their email security arsenal, while at the same time limiting the costs and complexity associated with upgrading to more powerful solutions.  With the introduction of MailGate Anti-Spam Appliance 2.5 with Enterprise Manager, Tumbleweed is bridging the gap between the simplicity and cost-effectiveness required for smaller organizations, and the enterprise-class features, transparent clustering, and high availability required for large scale enterprises.

"The simplicity, performance and rapid deployment time of dedicated appliances makes them very appealing when implementing a security infrastructure," said Brian Burke, Research Manager of Security Products, IDC.  "By adding the ability to centrally manage multiple devices through a single interface, Tumbleweed provides more options for IT organizations, and flexible method for securing email networks that scales with an organization's requirements."

   MailGate Anti-Spam Appliance 2.5 features:

• Scalable, flexible configuration
• Support for multiple appliances
• Transparent clustering, load balancing
• Local directory-based authentication for end users
• Centralized end-user queues
• Centralized management and reporting
• Single management console
• Single sign-on to all appliances
• Consistent policy across appliances
• No need for additional, dedicated console

"Tumbleweed is the only vendor to provide this level of scalability and performance through an appliance without the need for a dedicated console," said John Thielens, CTO of Tumbleweed.  "This gives our customers great flexibility to tailor solutions for their environments, and to scale their email infrastructure without scaling cost or complexity."

MailGate AntiSpam Appliance version 2.5 is available now. MailGate AntiSpam Appliance can be used alone, or in combination with other Tumbleweed email security products to provide complete, multi-tier email security.

About Tumbleweed MailGate AntiSpam Appliance
Tumbleweed MailGate AntiSpam Appliance is a top-rated, hardened email security appliance designed to remove spam and viruses from the email systems of small, medium and large enterprises.  Deployment of MailGate AntiSpam Appliance is simple and fast -- taking less than 30 minutes to set up, and requiring little administration after installation.  MailGate AntiSpam Appliance is available as a hardened Linux-based appliance.  MailGate AntiSpam Appliances can be used individually, or can be combined and managed through a single, centralized user interface.

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 Email Firewall, AntiSpam Appliance, Edge and 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 AntiSpam Appliance: A powerful and cost-effective turnkey anti-spam/anti-virus solution, available as a hardened Linux appliance.
• 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.

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. The 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 US Food and Drug Administration, the US Department of Defense, and all four branches of the US 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.

SAFE HARBOR STATEMENT
Tumbleweed cautions that forward-looking statements contained in this press release are based on plans and expectations as of the date of the press release, 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 features and performance of Tumbleweed's MailGate AntiSpam Appliance 2.5 and other MailGate products, as well as those of competing 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 May 10, 2005.

Tumbleweed assumes no obligation to update information contained in this press release, 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.