Stamps.com Broadens Infringement Claims Against Pitney Bowes

Company Asserts Infringement of Three Additional Patents by DM Mailing Systems

SANTA MONICA, Calif, — January 23, 2003 – Stamps.comTM (Nasdaq: STMP) announced today that it has filed a patent counterclaim against Pitney Bowes (NYSE: PBI) alleging that Pitney Bowes’ DM Series Mailing Systems infringe three Stamps.com patents. The DM Series, a line of digital metering products introduced by Pitney Bowes in April 2002, has been described by Pitney Bowes as “the most extensive and technologically advanced line of solutions they have introduced in their 82 year history.” In addition to seeking damages for Pitney Bowes’ infringement, Stamps.com’s counterclaim in the United States District Court in Delaware seeks a permanent injunction that would prohibit Pitney Bowes from making, using and selling infringing DM Series products. Stamps.com also answered Pitney Bowes’ latest complaint by denying Pitney Bowes’ allegations that its NetStamps(TM) product infringes Pitney Bowes’ patents.

In a separate suit that is expected to go to trial this year, Stamps.com seeks additional damages and a permanent injunction based on Pitney Bowes’ infringement of three other Stamps.com patents. “We look forward to vindicating our rights at trial this year and obtaining damages and injunctive relief. The counterclaim filed today will help further establish that Pitney Bowes’ DM Series mailers are based on Stamps.com’s patents,” said Seth Weisberg, Vice President and General Counsel of Stamps.com.

Stamps.com is committed to strategically managing and licensing its intellectual property portfolio to enhance shareholder value. Stamps.com has over 50 issued patents and 80 patent applications worldwide specifically related to computer-generated postage and digital metering technology.

About Stamps.com

Stamps.com (Nasdaq: STMP) is a leading provider of Internet-based postage services. Stamps.com enables customers to print U.S. Postal Service-approved postage with just a PC, printer and Internet connection. The company targets its services to small businesses, home offices, and individuals, and currently has partnerships with companies including Auctionwatch, CompUSA, Earthlink, HP, Microsoft, NCR, Office Depot, PayPal and the U.S. Postal Service.

“Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995: This release may contain forward-looking statements that involve risks and uncertainties. Important factors, including the company’s ability to complete its products and obtain regulatory approval, which could cause actual results to differ materially from those in the forward-looking statements, are detailed in filings with the Securities and Exchange Commission made from time to time by Stamps.com, including its Annual Report on Form 10-K for the fiscal year ended December 31, 2001, its subsequent Quarterly Reports on Form 10-Q, and its Current Reports on Form 8-K. Stamps.com undertakes no obligation to release publicly any revisions to any forward-looking statements to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Stamps.com, the Stamps.com logo and NetStamps are trademarks of Stamps.com Inc. All other brands and names are property of their respective owners.