STAMPS.COM SECOND QUARTER 2006 FINANCIAL RESULTS CALL INVITATION

LOS ANGELES — June 22, 2006 — This is an invitation to join the Stamps.com Second Quarter 2006 Financial Results Conference Call. The call will take place Tuesday, July 25, 2006 at 2:00 pm ET. The call will be web cast from our Investor Relations Web site at http://investor.stamps.com. The second quarter earnings press release will precede the earnings call at 8 am ET on July 25, 2006.

If you have any questions, please call Stamps.com Investor Relations at (310) 482-5830 or e-mail us at [email protected].

We look forward to your participation.

About Stamps.com and PhotoStamps

Stamps.com (Nasdaq: STMP) is a leading provider of Internet-based postage services. Stamps.com enables small businesses, enterprises, and consumers 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. Since launching PhotoStamps for the second market test in May 2005, over 14.5 million individual PhotoStamps have been ordered by the customers. PhotoStamps is currently available under authorization of the U.S. Postal Service for its third phase market test, with an initial authorization for one year through May 16, 2007 and an option for the Postal Service™ to extend the test for a second year.

“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, 2005, 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.