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CORRESP
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corresp

[ZixCorp Letterhead]

January 31, 2005

VIA EDGAR and FACSIMILE

Securities and Exchange Commission

450 Fifth Street, N.W.

Washington, D.C. 20549

    Attention:

    Adam Halper

Barbara C. Jacobs

    Re:

    Zix Corporation

Pre-Effective Amendment No. 2 to Registration Statement on Form S-3

Filed January 31, 2005; File No. 333-120548

Ladies and Gentlemen:

     Zix Corporation (the “Company”) hereby respectfully requests that the above-referenced
registration statement be declared effective at 10:00 a.m. EST on Thursday, February 3, 2005.

     The Company hereby acknowledges that:

    •
    it is aware of its responsibilities under the Securities Act of 1933 and the Securities
Exchange Act of 1934 as they relate to the proposed public offering of the securities
specified in the above-referenced registration statement;

    •
    should the Commission or the staff, acting pursuant to delegated authority, declare the
filing effective, the Company does not foreclose the Commission from taking any action with
respect to the filing;

    •
    the action of the Commission or the staff, acting pursuant to delegated authority, in
declaring the filing effective, does not relieve the Company from its full responsibility
for the adequacy and accuracy of the disclosure in the filing; and

    •
    the Company may not assert this action as defense in any proceeding initiated by the
Commission or any person under the federal securities laws of the United States.

     Upon grant of this request to accelerate effectiveness, please contact the undersigned at
(214) 370-2219 or Tanya Foreman at (214) 370-2223 to confirm the effectiveness of the
above-referenced registration statement.

     Thank you.

Respectfully submitted,

/s/ Ronald A. Woessner

Ronald A. Woessner

Sr. Vice President & General Counsel