Exhibit 99.15

                           CERTIFICATION PURSUANT TO
                            18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                 SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

     In connection with the Annual Report of Stamps.com Inc. (the "Company") on
Form 10-K for the period ending December 31, 2002 as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), I, Ken McBride, Chief
Executive Officer and Chief Financial Officer of the Company, certify, pursuant
to 18 U.S.C. (S) 1350, as adopted pursuant to (S) 906 of the Sarbanes-Oxley Act
of 2002, that:

(1)  The Report fully complies with the requirements of Section 13(a) or 15(d)
     of the Securities Exchange Act of 1934; and

(2)  The information contained in the Report fairly presents, in all material
     respects, the financial condition and result of operations of the Company.


/s/ KEN MCBRIDE

Ken McBride
Chief Executive Officer
March 28, 2003