Stamps.com to Present at Thomas Weisel Partners San Francisco Internet Conference

LOS ANGELES, Calif. – May 13, 2005 – Stamps.com® (Nasdaq: STMP) will be presenting at the Thomas Weisel Partners Internet Conference at the Four Seasons Hotel in San Francisco on Tuesday May 17, 2005. The Company will be presenting at 10:55 a.m. PT and a web cast will accompany the presentation and can be accessed via the investor relations website at investor.stamps.com.

About Stamps.com® and PhotoStamps™

Stamps.com (Nasdaq: STMP) is a leading provider of Internet-based postage services. Stamps.com enables over 375,000 customers to print U.S. Postal Service-approved postage with just a PC, printer and Internet connection, right from their home or office. The Company targets its services to small businesses and home offices, and currently has partnerships with companies including Microsoft, CompUSA, EarthLink, HP, NCR, Office Depot, Vendio and the U.S. Postal Service.

PhotoStamps is a patented Stamps.com product that couples the technology of PC Postage with the simplicity of a web-based image upload and order process. PhotoStamps was extremely popular during the initial market test which was announced on Aug. 10, and ran through Sept. 30, 2004. During that 7 1/2 week period, more than 2.75 million individual PhotoStamps were ordered. PhotoStamps is expected to be available under authorization of the U.S. Postal Service for a second, year-long market test beginning May 17, 2005.

“Safe Harbor” Statement under the Private Securities Litigation Reform Act of 1995: This release includes forward-looking statements about our anticipated results and available products that involve risks and uncertainties. Important factors, including the Company’s ability to complete and ship its products and obtain or maintain 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, 2004, Quarterly Reports on Form 10-Q, and 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 PhotoStamps are trademarks or registered trademarks of Stamps.com Inc. All other brands and names are property of their respective owners.