EX-32.1 4 d49119exv32w1.htm CERTIFICATION PURSUANT TO SECTION 906 exv32w1

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act
(18 U.S.C. Section 1350)
August 14, 2007
Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549
Ladies and Gentlemen:
     The certifications set forth below are being submitted in connection with the Quarterly Report on Form 10-Q (the “Report”) of Zix Corporation for the quarter ended June 30, 2007, as filed with the Securities Exchange Commission pursuant to Section 906 of the Sarbanes-Oxley Act (18 U.S.C. Section 1350).
     Richard D. Spurr, the chief executive officer, and Barry W. Wilson, the chief financial officer of Zix Corporation, each certifies that to the best of his knowledge and in their respective capacities as officers of Zix Corporation:
     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 results of operations of Zix Corporation as of the dates and for the periods expressed in the Report.
  /s/ Richard D. Spurr    
  Richard D. Spurr   
  Chairman, Chief Executive Officer, and President   
  /s/ Barry W. Wilson    
  Barry W. Wilson   
  Chief Financial Officer and Treasurer