
Tumbleweed Communications today that it has been granted <A HREF="http://www.tumbleweed.com/">U.S. Patent No. 6,609,196</A> by the U.S. Patent and Trademark Office, titled "Email Firewall with Stored Key Encryption/Decryption." Tumbleweed MMS complements and works with corporate email servers such as Microsoft Exchange, Lotus Notes, Novell Groupwise and a variety of UNIX-based email servers.