Exhibit 32-b CERTIFICATION BY CHIEF FINANCIAL OFFICER TRUSTMARK CORPORATION AND SUBSIDIARIES PURSUANT TO 18 U.S.C. ss. 1350 I, Zach L. Wasson, Treasurer of Trustmark, hereby certify that the accompanying report on Form 10-Q (Report) for the period ending September 30, 2003, and filed with the Securities and Exchange Commission on the date hereof pursuant to Section 13(a) of the Securities Exchange Act of 1934 by Trustmark, fully complies with the requirements of that section. I further certify that the information contained in the Report fairly presents, in all material aspects, the financial condition and results of operations of Trustmark. BY: /s/ Zach L. Wasson ------------------ Zach L. Wasson Treasurer (Principal Financial Officer) DATE: November 10, 2003