Business Editors, Hi-Tech Writers

    STAMFORD, Conn.--(BUSINESS WIRE)--Sept. 7, 1999--

    New Levels of Security Achieved to Protect Files
    From Theft or Damage

    Provides End-To-End Tracking of File Delivery

    Pitney Bowes Inc. (NYSE: PBI), the world's leader in mailing and messaging technology, said today its end-to-end web-based service, called iSend(sm), provides a more secure and reliable alternative to traditional e-mail. The company believes that demand for iSend will rise in the wake of a recent major security breach in a popular service, which could have permitted unauthorized access to millions of users' e-mail accounts.

Sensitive information transmitted over the Internet is controlled and protected through the iSend System's point-to-point security, including robust encryption, authentication and recipient password protection. iSend, which is now available at www.isend.com, is based on Tumbleweed Communications Corp. (NASDAQ: TMWD) Integrated Messaging Exchange(tm) (IME(tm)) technology. IME is a set of products and services that leverage the Internet and existing e-mail to enable secure, trackable, on-line communications.

iSend seamlessly interfaces with all existing e-mail applications and offers a convenient, around the clock alternative to expensive overnight package delivery and local courier services.

-- Reliable delivery. iSend combines the availability of e-mail for

notification with the more robust file transfer capabilities of

the web to greatly increase the reliability of online file

delivery.

-- Universal delivery. iSend message recipients require no special

software or proprietary protocols. Anyone with e-mail and web

access can use iSend to send and receive deliveries. In addition,

iSend integrates Adobe(R) Acrobat(R) Software to automatically

convert files into a Portable Document Format (PDF), so the

document can easily be viewed regardless of shared applications

between the sender and recipient. Everything from word-processing

documents to graphics to legal contracts and even multimedia

files can be delivered with ease and peace of mind.

-- Controlled delivery. iSend has sophisticated tracking features,

giving senders end-to-end visibility as to the progress of their

file delivery.

"There is a good deal of concern today about the security of e-mail," said Judy Martin, Vice President Strategic Marketing, Pitney Bowes Mailing Systems. "Tumbleweed's IME technology combined with Pitney Bowes' expertise in secure messaging systems provides peace-of-mind for e-mail users by ensuring the privacy of overnight delivery along with the speed of electronic transmission all in a single package."

Pitney Bowes is a $4.2 billion premier provider of informed mail and messaging management. For more information on iSend or other Pitney Bowes messaging solutions, please visit the company's web site at www.pitneybowes.com.

iSend(sm) is a service mark of Pitney Bowes Inc. Tumbleweed is a registered trademark of Tumbleweed Communications Corporation Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated

     --30--jc/ny*

     CONTACT: Lobsenz-Stevens Inc.
              Scott Tangney, 212/684-6300, ext. 313

     KEYWORD: NEW YORK CONNECTICUT
     INDUSTRY KEYWORD: COMPUTERS/ELECTRONICS TELECOMMUNICATIONS
INTERACTIVE/MULTIMEDIA/INTERNET COMED PRODUCT