EXHIBIT 99.1

                     CERTIFICATIONS PURSUANT TO SECTION 906
                        OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. ss.1350, I, the undersigned President (principal executive
officer) of j2 Global Communications, Inc. (the "Company"), hereby certify that
this Annual Report on Form 10-K of the Company for the year ended December 31,
2002 (the "Report") fully complies with the requirements of Section 13(a) of the
Securities Exchange Act of 1934 and that information contained in the Report
fairly presents, in all material respects, the financial condition and results
of operations of the Company.

                               /s/ Scott M. Jarus
                               ----------------------------
                               Scott M. Jarus
                               President
                               (Principal Executive Officer)

Dated: March 27, 2003


The foregoing certification is being furnished solely pursuant to 18 U.S.C.
ss.1350 and is not being filed as part of the Report or as a separate disclosure
document.