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First Horizon National Implements Tumbleweed Email Firewall to Fight Spam and Viruses

Email Firewall Blocks High Volumes of Spam, Slashes IT Management Time and Secures Outbound Communications for Leading Financial Institution

Redwood City, CA — November 22, 2004 — TumbleweedŽ Communications Corp. (NASDAQ:TMWD), the leading provider of e-mail and file transfer security solutions, today announced that First Horizon National Corp. (First Horizon) (NYSE:FHN) has deployed the Tumbleweed Email FirewallT to secure their inbound and outbound email communications. Tumbleweed Email Firewall protects, filters and secures First Horizon's email traffic at the Internet gateway with an integrated set of anti-spam, anti-virus, anti-hacker, content filtering, email relay, and encrypted messaging capabilities, protecting critical information, safeguarding network resources and users, and dramatically reducing costs.

First Horizon National companies have earned one of the highest customer retention rates of any financial institution in the country with their outstanding product mix and customer service. For First Horizon, protecting its email network from spam is critical to maintaining their high level of service. Prior to utilizing the Tumbleweed Email Firewall, the bank's email administrators struggled under a 65% spam incursion rate. First Horizon adopted Tumbleweed Email Firewall for its effectiveness, robust features and excellent ROI to provide management, security and anti-spam services throughout the entire distributed network.

"Tumbleweed Email Firewall has shielded our users from spam, freed network resources from unwanted email, and provided our customers with an increased level of privacy protection," said Garry Anderson, Manager of Research and Analysis for the First Horizon National Corporation. "With Tumbleweed Email Firewall, we are now blocking 65% of inbound email message as spam."

As a financial institution, First Horizon spends significant resources on securing their network. In addition to blocking spam, First Horizon wanted to evaluate secure messaging solutions to secure their outbound email communications. First Horizon has implemented Tumbleweed Email Firewall's secure messaging add-on module, which enables First Horizon to automatically encrypt email communications with their customers, partners, and suppliers by redirecting messages to a secure, Web-based delivery channel. Tumbleweed Secure Messenger allows First Horizon to ensure that any recipient with an email client and a browser can receive secure messages from their company - with no end-user training, proprietary desktop software, or digital certificates required. Combining Secure Messenger's browser-based secure delivery methods with the Tumbleweed Email Firewall's support for the S/MIME and TLS encryption protocols provides Fist Horizon with a comprehensive set of secure messaging options.

"For financial institutions like First Horizon, securing their network is critical to maintaining their high level of service," said Joe Fisher, VP of Product Marketing for Tumbleweed Communications. "Organizations like First Horizon are discovering that Tumbleweed can keep them in compliance with privacy protection regulations while simultaneously blocking spam and viruses."

About Tumbleweed Email Firewall
Tumbleweed Email Firewall has been recognized as the #1 enterprise software solution for fighting spam, according to Network World (http://www.nwfusion.com/reviews/2003/0915spam.html), and the #1 email firewall software for large enterprises by Information Security magazine. Tumbleweed Email Firewall protects, filters and secures email traffic at the Internet gateway with an integrated set of anti-spam, anti-virus, anti-hacker, content filtering, email relay and encrypted messaging capabilities -- minimizing email communications risks and reducing email management costs. Tumbleweed Email Firewall is used by more than 400 of the world's largest, most demanding messaging infrastructures, and is available in both appliance and software editions.

About Tumbleweed
A leading email security, file transfer security and identity validation company with more than 10 years in the business, Tumbleweed provides comprehensive solutions for managing mission critical data communication channels. From our e-mail security suite, point solutions for Spam, inbound and outbound filtering, to secure file transfer and certificate authentication, Tumbleweed has a variety of solutions currently used by enterprises and governments to help mitigate risk and increase network bandwidth. Tumbleweed 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, and the US Navy and Marine Corps. 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 Email Firewall. 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, Form 10-Q filed May 10, 2004, Form 10-Q filed August 12, 2004, and Form 10-Q filed November 9, 2004.

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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