Stamps.com First Quarter 2005 Financial Results Call Invitation

LOS ANGELES, April 13, 2005 – This is an invitation to join the Stamps.com (Nasdaq: STMP – News) First Quarter 2005 Financial Results Conference Call. The call will take place Thursday April 28, 2005 from 2:00pm to 3:00pm ET. The dial–in number is (913) 981–5536 (no passcode necessary). Additionally, the call will be web cast via the Investor Relations website at http://investor.stamps.com. The First Quarter Earnings press release will precede the Earnings Call at 8am ET on April 28, 2005.

About Stamps.com

Stamps.com (Nasdaq: STMP – News) 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 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, 2003, 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.