STAMPS.COM SERVICE AVAILABILITY NOW SCHEDULED FOR OCTOBER

PRE-REGISTRANTS FOR COMPANY’S INTERNET POSTAGE SERVICE APPROACH 100,000

Stamps.com Also Announces New Partnerships

Santa Monica, Calif., – Thursday, September 23, 1999 – Stamps.com(TM) (Nasdaq: STMP) today announced that it is now scheduled to make its Internet Postage(TM) service available in October. The company also announced that 94,072 people have already pre-registered for its service.

Stamps.com also announced new strategic partnerships with Lotus and ZDNet that will make the Stamps.com service available to millions of customers who use these partners’ products and services.

Already approved by the U.S. Postal Service, Stamps.com harnesses the power of the Internet to allow customers to print postage any time of the day or night using just a computer, printer and Internet connection. With Stamps.com’s convenient, secure and cost-effective service, customers will never have rush to the Post Office again.

“In the six weeks since Stamps.com received regulatory approval, we have experienced very strong demand for our service,” said Stamps.com CEO John Payne said. “With minimal advertising and marketing, our number of pre-registrants have grown from just 7,000 to almost 100,000. To accommodate this high demand, our continued development efforts are focused on delivering the highest quality service possible to the small business and individuals that will use Stamps.com Internet Postage. We know from our current users how quickly Stamps.com becomes an integral part of their lives. Our highest priority is providing a world-class service.”

Payne also said: “These new partnerships allow Stamps.com to increase our customer base by leveraging the strong brand equity these companies have within our target small business market.”

As part of the alliance with Lotus Development Corp., the Stamps.com service will be accessible through a SmartIcon on the Lotus Organizer Release 6 tool bar. Lotus Organizer is used by 42 million people worldwide. Through the partnership with ZDNet, the Stamps.com service will be made available to ZDNet’s millions of technology-interested visitors.

“Stamps.com is the best choice for anyone who wants to take advantage of the Internet to get their postage,” said Larry Grimm of L&G Transportation, who has been using the Stamps.com service as a beta tester. “With Stamps.com I don’t need hardware or address correction CD’s. Instead, I can do everything online and the set-up is easy and free.”

About Stamps.com

Founded in 1996, Santa Monica-based Stamps.com is the only commercially approved true Internet Postage service. The company’s innovative technology eliminates the need for specialized hardware by giving customers the flexibility to print postage over the Internet – securely, accurately and fast. Through partnerships with major companies like Microsoft, America Online, Quicken.com and Office Depot, Stamps.com has tremendous reach into the small office/home office and consumer markets. More information about the company can be found at sdcmainprod.wpengine.com.

“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 our ability to effectively manage the commercial release of our service, 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 Form 10-Q for the quarter ended June 30, 1999, and Stamps.com’s prospectus, related to its initial public offering, that was filed with the SEC on June 25, 1999.

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