SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G/A
                                 (Rule 13d-102)

   INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13D-1(B),
        (C) AND (D) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13D-2
                               (Amendment No. 4)*

                                 ZIX CORPORATION
                                (Name of Issuer)

                     Common Stock, par value $.01 per share
                         (Title of Class of Securities)

                                    98974P100
                                 (CUSIP Number)

                                February 13, 2006
             (Date of Event Which Requires Filing of this Statement)

     Check the appropriate box to designate the rule pursuant to which this
     Schedule is filed.

     [ ] Rule 13d-1(b)

     [X] Rule 13d-1(c)

     [ ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 or  otherwise  subject to the  liabilities  of that  section of the Act but
shall be subject to all other provisions of the Act (however, see the Notes).






CUSIP No.   98974P100               13G                        Page 2 of 6 Pages
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1.   NAMES OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
     George W. Haywood
--------------------------------------------------------------------------------

2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
                                                    (a)  [  ]
                                                    (b)  [  ]
--------------------------------------------------------------------------------

3.   SEC USE ONLY
--------------------------------------------------------------------------------

4.   CITIZENSHIP OR PLACE OF ORGANIZATION
     U.S.A.
--------------------------------------------------------------------------------

NUMBER OF         5.       SOLE VOTING POWER                       5,676,703 (1)
SHARES
BENEFICIALLY      --------------------------------------------------------------
OWNED BY          6.       SHARED VOTING POWER                     30,000 (2)
EACH
REPORTING         --------------------------------------------------------------
PERSON WITH       7.       SOLE DISPOSITIVE POWER                  5,676,703 (1)

                  --------------------------------------------------------------
                  8.       SHARED DISPOSITIVE POWER                30,000 (2)

--------------------------------------------------------------------------------

9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     5,706,703
--------------------------------------------------------------------------------

10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN SHARES (SEE
     INSTRUCTIONS)
                                                                [ ]
--------------------------------------------------------------------------------

11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
     11.4%
--------------------------------------------------------------------------------
12.  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
     IN
--------------------------------------------------------------------------------
(1)      Includes (a) 11,500 shares owned by children; (b) 115,000 held by the
         estate of Mr. Haywood's mother, of which Mr. Haywood is the executor;
         and (c) 463,556 shares underlying warrants.
(2)      Represents shares owned by spouse.


                                       2



Item 1(a).   Name of Issuer:

         Zix Corporation

Item 1(b).   Address of Issuer's Principal Executive Offices:

         2711 North Haskell Avenue, Suite 2300, LB 36, Dallas, Texas 75204-2960

Item 2(a).   Name of Person Filing:

         George W. Haywood

Item 2(b).   Address of Principal Business Office or, if none, Residence:

         c/o Cronin & Vris, LLP, 380 Madison Avenue, 24th Floor, New York, New
         York 10017

Item 2(c).   Citizenship:

         U.S.A.

Item 2(d).   Title of Class of Securities:

         Common Stock, par value $.01 per share

Item 2(e).   CUSIP Number

         98974P100

Item 3.      If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b)
             or (c), check whether the person filing is a:

         (a)[ ] Broker or dealer registered under Section 15 of the Exchange
                Act.

         (b)[ ] Bank as defined in Section 3(a)(6) of the Exchange Act.

         (c)[ ] Insurance company as defined in Section 3(a)(19) of the Exchange
                Act.

         (d)[ ] Investment company registered under Section 8 of the Investment
                Company Act.

         (e)[ ] An investment adviser in accordance with Rule 13d-1(b)(1)(ii)
                (E).

         (f)[ ] An employee benefit plan or endowment fund in accordance with
                Rule 13d-1(b)(1)(ii)(F).

                                       3


         (g)[ ] A parent holding company or control person in accordance with
                Rule 13d-1(b)(1)(ii)(G).

         (h)[ ] A savings association as defined in Section 3(b) of the Federal
                Deposit Insurance Act.

         (i)[ ] A church plan that is excluded from the definition of an
                investment company under Section 3(c)(14) of the Investment
                Company Act.

         (j)[ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

Item 4.      Ownership.

         (a) Amount Beneficially Owned:                                5,706,703
         (b) Percent of Class:                                             11.4%
         (c) Number of shares as to which such person has:

           (i)  sole power to vote or to direct the vote:              5,676,703
           (ii) shared power to vote or to direct vote:                   30,000
           (iii)sole power to dispose or to direct the disposition of: 5,676,703
           (iv) shared power to dispose or to direct the disposition of:  30,000

Item 5.      Ownership of Five Percent or Less of a Class.

             Not applicable

Item 6.   Ownership of More than Five Percent on Behalf of Another Person.

          Included as shares for which  there exist sole voting and  dispositive
          power are (a) 11,500  shares owned by Mr.  Haywood's  minor  children,
          which  children  have the right to  receipt  of  dividends  from,  and
          proceeds from the sale of, such shares; (b) 115,000 shares held by the
          estate of Mr. Haywood's  mother, of which Mr. Haywood is the executor;
          and (c) 463,556 shares underlying warrants.

          Included as shares for which there exist shared voting and dispositive
          power are 30,000 shares owned by Mr.  Haywood's  spouse.  Accordingly,
          Mr.  Haywood's  spouse  would  have the sole  right to the  receipt of
          dividends from, and the proceeds from the sale of, such shares.


                                       4




Item 7.   Identification and Classification of the Subsidiary Which Acquired the
          Security  Being  Reported on by the  Parent Holding Company or Control
          Person.

          Not applicable.

Item 8.   Identification and Classification of Members of the Group.

          Not applicable.

Item 9.   Notice of Dissolution of Group.

          Not applicable.

Item 10.  Certification.

          By  signing  below I certify  that,  to the best of my  knowledge  and
          belief, the securities referred to above were not acquired and are not
          held for the purpose of or with the effect of changing or  influencing
          the control of the issuer of the  securities and were not acquired and
          are not held in connection with or as a participant in any transaction
          having that purpose or effect.

                                       5




                                    SIGNATURE

           After  reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, complete and
correct.



                                           February 14, 2005
                                    -------------------------------
                                                 (Date)


                                          /s/George W. Haywood
                                    -------------------------------
                                               (Signature)


                                           George W. Haywood
                                    -------------------------------
                                             (Name/Title)