EXHIBIT 99.2
                                                                    ------------



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


     Pursuant to 18 U.S.C. ss.1350, I, the undersigned Chief Financial and
Marketing Officer of j2 Global Communications, Inc. (the "Company"), hereby
certify that the Quarterly Report on Form 10-Q of the Company for the quarterly
period ended September 30, 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/ Nehemia Zucker
                                           -------------------------------------
                                           Nehemia Zucker
                                           Chief Financial and Marketing Officer
                                           (Principal Financial Officer)

Dated: November 7, 2002