Stamps.com Announces PC Postage Version 5.0 With Advanced New User Interface

Company Also Announces Stamps.com Enterprise for Corporate–Wide Management of Mailing and Shipping Expenses

LOS ANGELES, June 29, 2005 – Stamps.com® (Nasdaq: STMP – News), the leading provider of Internet–based postage services, today announced the release of version 5.0 of its PC Postage software featuring a redesigned and more advanced user interface with simpler navigation and richer web content. In conjunction with the release of Version 5.0, Stamps.com today also announced it has launched a beta version of Stamps.com Enterprise, a significant product release that enables corporate customers to manage their Corporate–Wide mailing and shipping expenses.

“We expect the simpler and more web–centric user interface in version 5.0 to substantially improve ease–of–use for our customers,” said Stamps.com president and CEO Ken McBride. “In addition, Stamps.com Enterprise is a great new service that will allow us to target a segment of the market that we have not previously addressed.”

Version 5.0 is available immediately for download at www.stamps.com.

Additional new features in the software include the following:

• Integrated access to USPS® Carrier Pickup services
• Improved support for international NetStamps®, including detailed information on international mail rates, content restrictions and access to downloadable USPS customs forms
• Delivery time estimates for mail and packages based on USPS Service Standards, and provided based on the specific mailpiece characteristics including mail class and origin and delivery zip codes
• More flexible reporting capabilities, including new search, sort and filter features for all usage history data
• New address book support, including phone numbers and dynamic installers for up to date integrations
• Expanded email settings and preferences allowing users to customize messages and shipping features; and
• Enhanced customer access to information regarding their insurance and print transactions

Stamps.com Enterprise will allow businesses to easily view and manage their Corporate–Wide mailing and shipping expenses by aggregating data from multiple accounts and across multiple geographies, and making that information available from an easy–to–use web–based interface. Stamps.com Enterprise customers will be able to view detailed information – including postage purchases, postage prints, insurance transactions and store transactions – on a daily or monthly basis, and by individual location or in aggregate. Stamps.com currently has two corporate participants in its beta program for Stamps.com Enterprise and is seeking additional participants.

About Stamps.com and PhotoStamps

Stamps.com (Nasdaq: STMP – News) 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 that began 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.