Tumbleweed MailGate Email Firewall 6.2 Adds Support for OpenPGP Encryption

Tumbleweed(R) Communications Corp. (Nasdaq:TMWD), a leading provider of email security, managed file transfer, and identity validation appliance and software products, today announced the release of the MailGate Email Firewall 6.2, the latest version of Tumbleweed's award-winning email security suite offering comprehensive anti-spam, anti-virus, policy management, outbound content filtering, monitoring and encryption. With the addition of OpenPGP encryption, MailGate Email Firewall 6.2 now offers the most comprehensive set of gateway email encryption options on the market. And with added support for multiple LDAP directories and enhanced clustering capabilities, MailGate Email Firewall 6.2 can be integrated into the industry's broadest set of enterprise IT environments.

"Worldwide, organizations increasingly need to communicate securely with many external recipients such as customers, business partners, and government agencies," said Brian Burke, Research Manager, IDC. "As email security and encryption products mature, organizations are deploying more sophisticated email security solutions. For customers, the breadth of email encryption options supported, as well as enterprise-class manageability and visibility, are becoming critical differentiators for vendors in this market."

The MailGate Email Firewall version 6.2 adds OpenPGP encryption support to the product's current set of transparent secure messaging options, delivering the industry's most complete range of gateway encryption capabilities. These capabilities include:

-- SMG-certified and desktop S/MIME encryption and digital signing for interoperable, cross-vendor B2B secure messaging

-- Enforceable TLS encryption for relay-to-relay secure messaging to internal and external mail servers

-- OpenPGP encryption and digital signing for B2C secure messaging to individuals with PGP desktop software

-- A set of secure Web-based delivery mechanisms that provide universal B2C secure messaging

-- A secure staging server that uses customizable email
notifications to take the recipient to a secure Web
mailbox via SSL for online access to secure messages

-- A Secure Envelope(TM) that embeds the encrypted message in
an HTML attachment for offline access to secure messages


Additionally, having a complete policy-based encryption and decryption solution at the gateway ensures that the right business processes for email protection and security are in place, without the need for installation of desktop software. Desktop software can be both expensive to deploy and administer, as well as placing the burden for encryption and decryption management on each individual end user within an organization.

New features also include support for multiple LDAP sources to provide richer authentication and single sign-on options. The improved high availability and disaster recovery options provide industry-leading capabilities to meet service levels and maintain the integrity of enterprise email at the perimeter.

As email has become more and more mission critical to businesses and government organizations, they have begun to look for integrated, enterprise-class email security products to streamline, protect, and manage their email infrastructure. This is driven by the dramatic growth of spam, phishing, viruses, and spyware in inbound email, as well as the need to monitor and control the content of outbound email sent by the organization for regulatory compliance purposes (including HIPAA, GLBA, SB 1386, and Sarbanes-Oxley), and to protect sensitive customer and company data from disclosure.

"With this latest version of our MailGate Email Firewall, Tumbleweed is leading the industry in offering the highest levels of flexibility, performance and functionality while emphasizing the widest range of encryption options," said Craig Brennan, CEO of Tumbleweed. "The MailGate Email Firewall is an integrated solution that provides our customers with best-in-class capabilities to protect their organizations against today's email threats while reducing administrative costs."

The Tumbleweed MailGate Email Firewall version 6.2 is available now. MailGate Email Firewall can be used alone, or in combination with other Tumbleweed email security products to provide complete, multi-tier email security.

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 software, MailGate 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 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 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 software and appliances 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, Banc 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.

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 functionality and performance of Tumbleweed 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 August 9, 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.

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