STAMPS.COM PUBLIC OFFERING DECLARED EFFECTIVE

SANTA MONICA, Calif. – December 7, 1999 – Stamps.com™ (Nasdaq: STMP) today announced that its public offering was declared effective by the Securities and Exchange Commission for the sale of five million shares of Stamps.com common stock.

The company expects the shares, all of which are being offered by Stamps.com, will be delivered to the underwriters on December 10, 1999. Stamps.com has also granted the underwriters a 30-day option to purchase up to 750,000 additional shares of common stock to cover any over-allotments.

The offering was managed by Goldman, Sachs & Co., Salomon Smith Barney Inc., BancBoston Robertson Stephens Inc., Thomas Weisel Partners LLC and Volpe Brown Whelan & Company, LLC.

A copy of the Prospectus relating to the offering may be obtained from the Prospectus Department of Goldman, Sachs & Co., at 85 Broad Street, New York, NY 10004, 212-902-1000, when available. The registration statement can also be viewed on the Internet at http://www.freeedgar.com.

About Stamps.com

Stamps.com offers a convenient, cost-effective and easy-to-use service for purchasing and printing postage over the Internet. Its core service is approved by the U.S. Postal Service and is currently the only commercially available offering that requires no additional hardware to purchase and print postage; the user’s existing PC, printer and Internet setup are sufficient. Through partnerships with major companies like America Online, IBM, Microsoft, Office Depot, Quicken.com and 3M, Stamps.com targets the small office/home office and consumer markets. More information about the company can be found at sdcmainprod.wpengine.com.

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“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, 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 September 30, 1999 and its registration statement on Form S-1, as amended, that was declared effective by the SEC on December 6, 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.