EXHIBIT 3.1


                            STATEMENT OF DESIGNATIONS
                 OF THE SERIES A CONVERTIBLE PREFERRED STOCK OF
                                 ZIX CORPORATION


         The undersigned, Ronald A. Woessner, does hereby certify that:

                  (a) he is, and at all times mentioned herein was, the duly
elected Senior Vice President and General Counsel of Zix Corporation, a Texas
corporation (the "Corporation");

                  (b) the Restated Articles of Incorporation of the Corporation,
filed with the Secretary of State of the State of Texas on December 4, 2001, as
amended (the "Articles of Incorporation"), authorize the Board of Directors of
the Corporation to provide for the issuance of the Preferred Stock from time to
time in one or more series, to establish the number of shares to be included in
each series, and to fix the designations, powers, relative rights,
qualifications, preferences, limitations and restrictions of the shares of each
such series;

                  (c) the Board of Directors of the Corporation adopted the
following resolutions on September 9, 2002, at a special meeting of the Board of
Directors of the Corporation, and such resolutions have not been rescinded or
amended and are in full force and effect as of the date hereof:


                  WHEREAS, the Restated Articles of Incorporation of the
Corporation, filed with the Secretary of State of the State of Texas on December
4, 2001, as amended (the "Articles of Incorporation"), authorize the Corporation
to issue ten million (10,000,000) shares of Preferred Stock, par value $1.00 per
share ("Preferred Stock"); and

                  WHEREAS, the Articles of Incorporation authorize the Board of
Directors of the Corporation (the "Board"), within the limitations set forth in
the Texas Business Corporation Act (the "Corporation Act"), to provide for the
issuance of the Preferred Stock from time to time in one or more series, to
establish the number of shares to be included in each series, and to fix the
designations, powers, relative rights, qualifications, preferences, limitations
and restrictions of the shares of each such series not fixed by the Articles of
Incorporation; and

                  WHEREAS, the Articles of Incorporation do not fix the
designations, powers, relative rights, qualifications, preferences, limitations
and restrictions of any of the Preferred Stock; and

                  WHEREAS, there are no outstanding Statements of Designations
of Preferred Stock with respect to any shares of the Corporation's authorized
but unissued Preferred Stock, other than that certain Statement of Designations
of the Series B Convertible Preferred Stock of Zix Corporation, filed
contemporaneously herewith, providing for the designation of a series of one
million three hundred four thousand eight hundred fifteen (1,304,815) shares of
Preferred Stock; and

                  WHEREAS, based on the foregoing, there remains eight million
six hundred ninety-five thousand one hundred eighty-five (8,695,185) shares of
the Corporation's authorized but unissued Preferred Stock eligible for
designation by the Corporation with respect to new series thereof; and





                                       1


                  WHEREAS, it is the desire of the Board to designate a "Series
A Convertible Preferred Stock" consisting of eight hundred nineteen thousand
eight hundred eighty-six (819,886) shares of the Corporation's authorized but
unissued Preferred Stock, and to fix the powers, relative rights,
qualifications, preferences, limitations and restrictions thereof;

                  NOW, THEREFORE, BE IT RESOLVED, that pursuant to the authority
expressly granted to and vested in the Board by the provisions of the Articles
of Incorporation, there hereby is created, out of the ten million (10,000,000)
shares of Preferred Stock authorized in Article IV of the Articles of
Incorporation, a series of Preferred Stock of the Corporation consisting of
eight hundred nineteen thousand eight hundred eighty-six (819,886) shares,
having the following powers, relative rights, qualifications, preferences,
limitations and restrictions:

         1. Designation; Number of Shares; Original Issue Price. The shares of
such series will be designated as "Series A Convertible Preferred Stock" (the
"Series A Preferred"). The number of shares of Series A Preferred will be
limited to eight hundred nineteen thousand eight hundred eighty-six (819,886).
The original issue price of the Series A Preferred is $3.92 per share (the
"Original Issue Price").

         2. Rank. The Series A Preferred will rank, with respect to rights on
Liquidation (as defined in Section 4(c)), (a) senior to the common stock, par
value $0.01 per share, of the Corporation (the "Common Stock") and each other
class of capital stock or series of Preferred Stock established after the date
of this Statement of Designations that does not expressly provide that it ranks
senior to or on parity with the Series A Preferred as to rights on Liquidation
(collectively referred to as "Junior Securities"), (b) on a parity with the
Series B Convertible Preferred Stock, par value $1.00 per share, of the
Corporation (the "Series B Preferred") and each other class of capital stock or
series of Preferred Stock established after the date of this Statement of
Designations that expressly provides that such class or series will rank on a
parity with the Series A Preferred as to rights on Liquidation (collectively
referred to as "Parity Securities") and (c) junior to each other class of
capital stock or series of Preferred Stock established after the date of this
Statement of Designations that expressly provides that such class or series will
rank senior to the Series A Preferred as to rights on Liquidation (collectively
referred to as "Senior Securities").

         3. Dividends. The holders of the Series A Preferred will be entitled to
receive, out of any funds at the time legally available therefor, a per annum
dividend equal to six and one-half percent (6.50%) of the Original Issue Price
(as adjusted for any recapitalizations, stock splits or combinations of the
Series A Preferred or stock dividends on the Series A Preferred to the extent
paid in shares of Series A Preferred) (the "Series A Preferred Dividends"). The
Series A Preferred Dividends will be payable when and as declared by the Board,
will be cumulative and will accrue on each share of Series A Preferred from day
to day, commencing on the date of issuance of such share, whether or not earned
or declared. The Corporation will not declare, pay or set aside for payment any
dividend or distribution (whether in cash, securities or other property, other
than dividends or distributions payable solely in shares of Common Stock) to the
holders of the Common Stock or any other Junior Securities until all Series A
Preferred Dividends have been paid at the rate specified above, including all
dividends that have accumulated but remain unpaid. All Series A Preferred
Dividends will be payable in the manner provided in Section 5 and Section 7.




                                       2


         4. Liquidation Preference. Upon the occurrence of a Liquidation,
distributions to the holders of Series A Preferred will be made in the following
manner:

                  (a) Priority of Distributions to Series A Preferred on
         Liquidation. After payment or provision for payment of the
         Corporation's debts and other liabilities and any payments and
         distributions payable to the holders of any Senior Securities has been
         made, the holders of Series A Preferred then outstanding will be
         entitled to receive, prior and in preference to any distribution of any
         assets or surplus funds of the Corporation to the holders of shares of
         Common Stock or other Junior Securities by reason of their ownership of
         such stock, an amount equal to the Series A Liquidation Preference (as
         defined in Section 4(c)). If, upon any Liquidation, the assets and
         surplus funds of the Corporation are insufficient to make payment in
         full of the Series A Liquidation Preference and any payments and
         distributions payable to the holders of any Parity Securities
         (including the Series B Preferred), then such assets and funds will be
         distributed ratably among the holders of Series A Preferred and the
         holders of Parity Securities then outstanding in proportion to the full
         amounts to which they would otherwise be entitled.

                  (b) Valuation of Non-Cash Assets. If any of the assets
         distributed by the Corporation upon a Liquidation is other than cash,
         its value will be deemed to be its fair market value determined as
         follows:

                           (i) Securities not subject to restrictions on free
                  marketability will be valued as follows: (A) if traded on a
                  securities exchange or through the Nasdaq Market, the value
                  will be deemed to be the average of the closing prices of the
                  securities on such exchange or market over the thirty (30) day
                  period ending on the business day immediately prior to date of
                  the Liquidation; (B) if actively traded over-the-counter, the
                  value will be deemed to be the average of the closing sale
                  price, or, if there is no sale on a particular date, the
                  closing bid price, over the thirty (30) day period ending on
                  the business day immediately prior to date of the Liquidation;
                  and (C) if there is no active public market, the value will be
                  the fair market value thereof, as determined in good faith by
                  the Board.

                           (ii) Securities subject to restrictions on free
                  marketability (other than restrictions arising solely by
                  virtue of a shareholder's status as an affiliate or former
                  affiliate) will be valued in such a manner as to make an
                  appropriate discount from the market value determined pursuant
                  to Section 4(b)(i) to reflect the approximate fair market
                  value thereof, as determined in good faith by the Board.

                           (iii) Any other asset will be valued at its fair
                  market value as determined in good faith by the Board.

                  (c) Certain Definitions.

                           (i) "Change of Control" means (1) the sale, transfer
                  or other disposition of all or substantially all of the assets
                  of the Corporation (other than a





                                       3


                  transfer by pledge or mortgage to a bona fide lender) or (2)
                  the merger or consolidation of the Corporation with or into
                  any other entity, or the consummation of any other transaction
                  or series of related transactions by the shareholders of the
                  Corporation, that results in the shareholders of the
                  Corporation immediately prior to such merger, consolidation,
                  transaction or series of related transactions owning less than
                  a majority of the voting securities of the Corporation (or the
                  surviving entity in any such merger or consolidation)
                  immediately following such merger, consolidation, transaction
                  or series of related transactions. The Corporation will give
                  each holder of Series A Preferred written notice of a Change
                  of Control not less than thirty (30) business days prior to
                  the consummation thereof.

                           (ii) "Liquidation" means the occurrence of any one of
                  the following events: (A) any liquidation, dissolution or
                  winding up of the Corporation, either voluntary or involuntary
                  (other than a liquidation, dissolution or winding up effected
                  for the purpose of reincorporating the Corporation in another
                  jurisdiction wherein the rights of the Series A Preferred are
                  not adversely affected) or (B) a Change of Control, if and
                  only if the holders of a majority of the shares of Series A
                  Preferred then outstanding elect to treat such Change of
                  Control as a Liquidation by delivering a written notice of
                  such election, executed by such holders, to the Corporation
                  not less than twenty-three (23) business days prior to the
                  consummation thereof. The Corporation will promptly, but in no
                  event more than three (3) business days following the receipt
                  of such election, notify the holders of the Senior Convertible
                  Notes of such election by the holders of Series A Preferred.

                           (iii) "Senior Convertible Notes" means those certain
                  Convertible Notes, convertible into shares of Common Stock
                  under certain circumstances, issued on the First Issue Date.

                           (iv) "Series A Liquidation Preference" means, for
                  each share of Series A Preferred, 100% of the sum of (A) the
                  Original Issue Price (as adjusted for any recapitalizations,
                  stock splits or combinations of the Series A Preferred or
                  stock dividends on the Series A Preferred to the extent paid
                  in shares of Series A Preferred) and (B) the amount of all
                  Series A Preferred Dividends payable in respect of such share
                  that have accumulated through the date of Liquidation but
                  remain unpaid.

         5. Conversion Rights. Subject to the limitations set forth in Section
8, the shares of Series A Preferred will be convertible into shares of Common
Stock as follows:

                  (a) Optional Conversion of Series A Preferred. Each share of
         Series A Preferred will be convertible at the option of the holder
         thereof, at any time, into fully paid and nonassessable shares of
         Common Stock. Any holder of Series A Preferred may exercise the
         conversion right pursuant to this Section 5(a) as to all of such
         holder's shares of Series A Preferred, or any portion thereof. To
         exercise its conversion rights pursuant to this Section 5(a), a holder
         must deliver to the Corporation during regular business





                                       4


         hours, at the Corporation's principal office or at the office of any
         transfer agent of the Corporation for such Series A Preferred, as the
         case may be, or at such other place as may be designated by the
         Corporation, the certificate or certificates for the shares of Series A
         Preferred to be converted, duly endorsed for transfer to the
         Corporation (if required by it), accompanied by written notice stating
         that the holder elects to convert such shares. Notwithstanding the
         foregoing, for so long as Section 8(a) is in effect, no holder will be
         entitled to exercise conversion rights pursuant to this Section 5(a) to
         the extent that the aggregate number of shares of Common Stock issued
         to such holder upon conversion or redemption of shares of Series A
         Preferred (whether pursuant to this Section 5(a) or otherwise) will be
         greater than the product (the "Allocated Number") of the Maximum Number
         (as defined in Section 8(a)) multiplied by a fraction, the numerator of
         which is the number of shares of Series A Preferred originally issued
         to such holder and the denominator of which is two million one hundred
         twenty-four thousand seven hundred one (2,124,701). Upon any transfer
         of shares of Series A Preferred, a proportionate amount of the
         Allocated Number will be deemed transferred from the transferor of such
         shares to the transferee of such shares.

                  (b) Mandatory Conversion of Series A Preferred. Each share of
         Series A Preferred will be convertible at the option of the
         Corporation, following the satisfaction of the Mandatory Conversion
         Condition (as defined below), into fully paid and nonassessable shares
         of Common Stock. The Corporation may exercise its conversion right
         pursuant to this Section 5(b) as to all of the outstanding shares of
         Series A Preferred, or any portion thereof. If the Corporation
         exercises its conversion rights pursuant to this Section 5(b) as to
         less than all of the outstanding shares of Series A Preferred, the
         shares of Series A Preferred to be converted will be allocated pro rata
         among the holders of the outstanding shares of the Series A Preferred
         in proportion to the number of such shares then held by each such
         holder. The Corporation may exercise its conversion rights pursuant to
         this Section 5(b) only if the Corporation simultaneously exercises its
         conversion rights pursuant to any substantially similar provision of
         the Statement of Designations of the Series B Convertible Preferred
         Stock of Zix Corporation with respect to a substantially similar
         proportion of the outstanding shares of Series B Preferred. To exercise
         its conversion rights pursuant to this Section 5(b), the Corporation
         must deliver to each holder of record of Series A Preferred a written
         notice setting forth the effective date of such conversion (which may
         not be earlier than the date such notice is given), the aggregate
         number of shares of Series A Preferred that the Corporation elects to
         convert, the number of shares of Series A Preferred held by such holder
         to be converted and the procedures to be followed by such holder to
         surrender the certificates representing the shares of Series A
         Preferred being converted. Upon receipt of such notice of mandatory
         conversion, each holder of Series A Preferred must surrender the
         certificates evidencing the shares of Series A Preferred to be
         converted to the Corporation at the place designated in such notice and
         will thereupon be entitled to receive certificates representing the
         shares of Common Stock into which such shares of Series A Preferred
         have been converted. The "Mandatory Conversion Condition" is that, at
         any time following the effectiveness of a registration statement, filed
         under the Securities Act of 1933, as amended, covering the resale of
         the shares of Common Stock issuable upon the conversion of shares of
         Series A Preferred, the closing price (last trade) of the Common Stock
         on the Principal Market (as defined below) is above $6.18 per share (as
         adjusted






                                       5


         for any recapitalizations, stock splits or combinations of the Common
         Stock or stock dividends on the Common Stock to the extent paid in
         shares of Common Stock) for the ten (10) consecutive trading days
         immediately preceding the date of the Corporation's written notice of
         mandatory conversion. "Principal Market" means the Nasdaq National
         Market or, if the Common Stock is not traded on the Nasdaq National
         Market, then the principal securities exchange or trading market for
         the Common Stock.

                  (c) Conversion Rate. The number of shares of Common Stock into
         which each share of Series A Preferred will be converted pursuant to
         this Section 5 will be determined by dividing (i) the sum of (A) the
         Original Issue Price (as adjusted for any recapitalizations, stock
         splits or combinations of the Series A Preferred or stock dividends on
         the Series A Preferred to the extent paid in shares of Series A
         Preferred) and (B) the amount of all Series A Preferred Dividends
         payable in respect of such share that have accumulated through the date
         of conversion but remain unpaid by (ii) the Conversion Price in effect
         at the time of the conversion. The initial "Conversion Price" is $4.12
         per share, subject to adjustment as provided in Section 6.

                  (d) Conversion Date. Conversion will be deemed to be effective
         on the date when all required deliveries for optional conversion set
         forth in Section 5(a) have been made or the effective date set forth in
         the Corporation's notice of mandatory conversion pursuant to Section
         5(b), and such date is referred to herein as the "Conversion Date." As
         promptly as practicable after the Conversion Date (or such later date
         on which certificates representing converted shares of Series A
         Preferred have been surrendered by a holder to the Corporation in
         accordance with the Corporation's notice of mandatory conversion), the
         Corporation will issue and deliver to the holder a certificate or
         certificates for the number of full shares of Common Stock to which
         such holder is entitled and a check for cash with respect to any
         fractional interest as provided in Section 5(e). The holder will be
         deemed to have become a shareholder of record of Common Stock on the
         applicable Conversion Date unless the transfer books of the Corporation
         are closed on that date, in which event the holder will be deemed to
         have become a shareholder of record of Common Stock on the next
         succeeding date on which the transfer books are open, but the
         Conversion Price will be that in effect on the Conversion Date. Upon
         conversion of only a portion of the number of shares of Series A
         Preferred represented by a certificate surrendered for conversion, the
         Corporation will issue and deliver to the holder a new certificate for
         the number of shares of Series A Preferred represented by the
         unconverted portion of the certificate surrendered.

                  (e) Fractional Shares. No fractional shares of Common Stock
         will be issued upon conversion of shares of Series A Preferred and the
         number of shares of Common Stock issued upon any conversion will be
         rounded down to the nearest whole share. Instead of issuing any
         fractional shares of Common Stock that would otherwise be issuable upon
         conversion of any shares of Series A Preferred, the Corporation will
         pay a cash amount in respect of such fractional interest equal to the
         fractional interest multiplied by the Conversion Price. If the shares
         of Series A Preferred being converted by a holder at one time are
         represented by more than one certificate surrendered for conversion,
         the number of whole shares of Common Stock issuable upon such
         conversion






                                       6


         will be computed on the basis of the aggregate number of shares of
         Series A Preferred to be converted and represented by all such
         surrendered certificates.

                  (f) Taxes. The Corporation will pay any and all issue and
         other taxes that may be payable in respect of any issue or delivery of
         shares of Common Stock on conversion of Series A Preferred pursuant
         hereto. The Corporation will not, however, be required to pay any tax
         that may be payable in respect of any transfer involved in the issue
         and delivery of shares of Common Stock in a name other than that in
         which the shares of Series A Preferred so converted were registered,
         and no such issue or delivery will be made unless and until the person
         requesting such issue has paid to the Corporation the amount of any
         such tax, or has established, to the satisfaction of the Corporation,
         that such tax has been paid.

                  (g) No Reissuance of Shares. All certificates of Series A
         Preferred surrendered for conversion will be appropriately canceled on
         the books of the Corporation, and the shares so converted will not
         thereafter be issuable by the Corporation.

         6. Adjustment of the Conversion Price. The Conversion Price in effect
from time to time will be subject to adjustment from time to time as follows:

                  (a) Subdivisions, Stock Dividends or Combinations. If the
         Corporation, at any time after the effective date of this Statement of
         Designations (the "Effective Date"), subdivides the outstanding shares
         of Common Stock, or issues a dividend on its outstanding Common Stock
         in shares of Common Stock or securities exchangeable or convertible
         into shares of Common Stock, each of the Issue Date Market Price (as
         defined in Section 6(d)(vii)) and the Conversion Price in effect
         immediately prior to such subdivision or the issuance of such dividend
         will be proportionately decreased, and in case the Corporation at any
         time combines the outstanding shares of Common Stock, each of the Issue
         Date Market Price and the Conversion Price in effect immediately prior
         to such combination will be proportionately increased, effective at the
         close of business on the date of such subdivision, dividend or
         combination, as the case may be.

                  (b) Other Distributions. If the Corporation, at any time after
         the Effective Date, declares a distribution on its outstanding Common
         Stock payable in securities (other than shares of Common Stock or
         securities exchangeable or convertible into shares of Common Stock),
         evidences of indebtedness issued by the Corporation or other persons or
         other assets (other than cash dividends), then, in each such case, the
         holders of Series A Preferred will be entitled to a proportionate share
         of any such distribution as though they were the holders of the number
         of shares of Common Stock of the Corporation into which their shares of
         Series A Preferred are convertible as of the record date fixed for the
         determination of the holders of Common Stock of the Corporation
         entitled to receive such distribution.

                  (c) Reorganization or Reclassification. Upon the effectiveness
         of any capital reorganization (other than a subdivision or combination
         of outstanding shares of Common Stock or a Liquidation) or any
         reclassification of the capital stock of the






                                       7


         Corporation, each share of Series A Preferred will thereafter be
         convertible into the number of shares of stock or other securities or
         property to which a holder of the number of shares of Common Stock of
         the Corporation deliverable upon conversion of such Series A Preferred
         would have been entitled upon such reorganization or reclassification;
         and, in any such case, appropriate adjustment (as determined in good
         faith by the Board) will be made in the application of the provisions
         herein set forth with respect to the rights and interests thereafter of
         the holders of the Series A Preferred, to the end that the provisions
         set forth herein (including provisions with respect to changes in and
         other adjustments of the Conversion Price) will thereafter be
         applicable, as nearly as reasonably may be, in relation to any share of
         stock or other property thereafter deliverable upon the conversion of
         the Series A Preferred.

                  (d) Discount Sale of Common Stock. The Conversion Price will
         be adjusted in accordance with this Section 6(d) in the event that the
         Corporation consummates any Discount Sale of Common Stock (as defined
         in Section 6(d)(vii)). The provisions of this Section 6(d) will
         similarly apply to successive Discount Sales of Common Stock.

                           (i) Weighted Average. Upon the consummation of any
                  Discount Sale of Common Stock, the Conversion Price
                  theretofore in effect will become the greater of the Minimum
                  Conversion Price or the price, calculated to the nearest cent,
                  obtained by dividing:

                                    (A) an amount equal to the sum of (1) the
                           then-existing Conversion Price multiplied by the
                           number of shares of Common Stock outstanding
                           immediately prior to such Discount Sale of Common
                           Stock (assuming the full exercise of all options,
                           rights and warrants then exercisable for Equity
                           Securities and the full conversion or exchange of all
                           Equity Securities that are then convertible or
                           exchangeable for Common Stock, including all shares
                           of the Series A Preferred, at the rate of conversion
                           or exchange then in effect) and (2) an amount equal
                           to the aggregate consideration received by the
                           Corporation upon such Discount Sale of Common Stock;

                           by

                                    (B) the number of shares of Common Stock
                           outstanding immediately after such Discount Sale of
                           Common Stock (assuming the full exercise of all
                           options, rights and warrants then exercisable for
                           Equity Securities and the full conversion or exchange
                           of all Equity Securities that are then convertible or
                           exchangeable for Common Stock, including all shares
                           of the Series A Preferred, at the rate of conversion
                           or exchange then in effect).

                           (ii) Valuation of Consideration. In the case of a
                  Discount Sale of Common Stock for cash, the "aggregate
                  consideration received" by the Corporation therefor will be
                  deemed to be the amount of cash received before deducting
                  therefrom any commissions or expenses paid by the Corporation.
                  In






                                       8


                  case of a Discount Sale of Common Stock for consideration
                  other than cash, or consideration partly other than cash, the
                  value of the "aggregate consideration received" other than
                  cash received by the Corporation for such shares will be the
                  fair market value of such property received by the Corporation
                  as determined in accordance with Section 4(b).

                           (iii) Issuance of Options to Purchase Common Stock.
                  If the Corporation issues any options, rights or warrants to
                  subscribe for or purchase shares of Common Stock, all shares
                  of Common Stock issuable upon the exercise of such options,
                  rights or warrants will be deemed issued as of the date such
                  options, rights or warrants are issued, and the amount of the
                  "aggregate consideration received" by the Corporation for such
                  deemed issuance of Common Stock will be deemed to be the total
                  of (A) the amount of consideration received by the
                  Corporation, if any, upon the issuance of such options, rights
                  or warrants, plus (B) the minimum aggregate consideration, if
                  any, other than the surrender of such options, rights or
                  warrants, to be received by the Corporation upon the exercise
                  of such options, rights or warrants for shares of Common
                  Stock.

                           (iv) Issuance of Convertible Securities. If the
                  Corporation issues any obligations or shares of stock that
                  are, or may be under specified circumstances, convertible into
                  or exchangeable for Common Stock, all shares of Common Stock
                  issuable upon the conversion or exchange of such obligations
                  or shares will be deemed issued as of the date such
                  obligations or shares are issued, and the amount of the
                  "aggregate consideration received" by the Corporation for such
                  deemed issuance of Common Stock will be deemed to be the total
                  of (A) the amount of consideration received by the
                  Corporation, if any, upon the issuance of such obligations or
                  shares, plus (B) the minimum aggregate consideration, if any,
                  other than the surrender of such obligations or shares, to be
                  received by the Corporation upon such conversion or exchange
                  for shares of Common Stock.

                           (v) Issuance of Options to Purchase Convertible
                  Securities. If the Corporation issues any options, rights or
                  warrants to subscribe for or purchase any obligations or
                  shares of stock that are, or may be under specified
                  circumstances, convertible into or exchangeable for Common
                  Stock, all shares of Common Stock issuable upon the exercise
                  of such options, rights or warrants for such obligations or
                  shares and the concurrent conversion or exchange or such
                  obligations or shares for shares of Common Stock will be
                  deemed issued as of the date such options, rights or warrants
                  are issued, and the amount of the "aggregate consideration
                  received" by the Corporation for such deemed issuance of
                  Common Stock will be deemed to be the total of (A) the amount
                  of consideration received by the Corporation, if any, upon the
                  issuance of such options, rights or warrants, plus (B) the
                  minimum aggregate consideration, if any, other than the
                  surrender of such options, rights or warrants, to be received
                  by the Corporation upon the exercise of such options, rights
                  or warrants for such obligations or shares, plus (C) the
                  minimum aggregate consideration, if any, other than the
                  surrender of such obligations or shares, to be received by the
                  Corporation upon such conversion or exchange of such
                  obligations or shares for shares of Common Stock.




                                       9


                           (vi) Recalculation Upon Expiration of Options. On the
                  expiration of any options, rights or warrants referred to in
                  Section 6(d)(iii) or Section 6(d)(v) or the termination of any
                  right of conversion or exchange referred to in Section
                  6(d)(iv) or Section 6(d)(v) or upon any change in the number
                  of shares of Common Stock deliverable or actually delivered
                  upon the exercise of such options, rights or warrants or upon
                  the conversion of or exchange of such convertible or
                  exchangeable securities, the Conversion Price then in effect
                  will forthwith be readjusted to the Conversion Price that
                  would have been obtained had the adjustments made upon the
                  issuance of such option, right or convertible or exchangeable
                  securities been made upon the basis of the delivery of only
                  the number of shares of Common Stock actually delivered or to
                  be delivered upon the exercise of such options, rights or
                  warrants or upon the conversion or exchange of such
                  securities. No readjustment pursuant to this Section 6(d)(vi)
                  will have the effect of increasing the Conversion Price to an
                  amount that exceeds the lower of (A) the Conversion Price on
                  the original adjustment date or (B) the Conversion Price that
                  would have resulted from other Discount Sales of Common Stock
                  occurring between the Effective Date and such adjustment date;
                  provided, however, that nothing in this Section 6(d)(vi) will
                  limit the application of Section 6(a) under the circumstances
                  described therein.

                           (vii) Certain Definitions.

                                    (A) "Discount Sale of Common Stock" means
                           any issuance, other than an Exempt Issuance (as
                           defined below), by the Corporation of any Equity
                           Security after the First Issue Date for consideration
                           per share of Common Stock, or per share of Common
                           Stock into which such Equity Security is exercisable
                           and/or convertible, that is less than the Conversion
                           Price in effect immediately prior to the effective
                           time of such issuance or sale.

                                    (B) "Equity Security" means (1) Common
                           Stock, (2) any right or option to purchase Common
                           Stock, (3) any obligation or security convertible
                           into or exchangeable for Common Stock and (4) any
                           right or option to purchase any obligation or
                           security convertible into or exchangeable for Common
                           Stock.

                                    (C) "Exempt Issuance" means any issuance of
                           Equity Securities (1) pursuant to any employee
                           benefit plan of the Corporation in effect on the
                           First Issue Date; (2) to officers, directors,
                           employees or consultants of the Corporation pursuant
                           to the grant or exercise of options that are granted
                           pursuant to any employee benefit plan approved by the
                           shareholders of the Corporation after the First Issue
                           Date to the extent that such issuance, together will
                           all other issuances to which this clause (2) has been
                           applied, will not result in the issuance or potential
                           issuance of more than 4,000,000 shares of Common
                           Stock (as adjusted for any recapitalizations, stock
                           splits or combinations of the Common Stock or stock
                           dividends on the Common Stock to the extent paid in
                           shares of




                                       10


                           Common Stock); (3) upon the conversion, exchange or
                           exercise of any right, option, obligation or security
                           outstanding on the First Issue Date, provided that
                           the terms of any such right, option, obligation or
                           security are not amended or otherwise altered on or
                           after the First Issue Date; (4) in connection with
                           the sale and issuance of shares of Series A
                           Preferred, shares of Series B Preferred and Senior
                           Convertible Notes on the First Issue Date (including
                           (a) the issuance of warrants to the initial
                           purchasers of Series A Preferred, Series B Preferred
                           and Senior Convertible Notes and (b) the conversion,
                           redemption, exchange or exercise of such Series A
                           Preferred, Series B Preferred, Senior Convertible
                           Notes and warrants in accordance with their
                           respective terms), provided that the terms of any
                           such securities are not amended or otherwise altered
                           on or after the First Issue Date; (5) in connection
                           with any stock dividend, stock subdivision,
                           reorganization or recapitalization described in
                           Section 6(a) or Section 6(c); (6) (a) to suppliers,
                           customers or strategic partners of the Corporation
                           investing in connection with a commercial
                           relationship with the Corporation, the primary
                           purpose of which is not to raise capital, and (b) as
                           consideration for mergers or consolidations or
                           acquisitions of businesses or their tangible or
                           intangible assets, other than transactions in which
                           cash or cash equivalents represent a majority of the
                           assets acquired, provided that the aggregate number
                           of shares of Common Stock that may be issued or
                           potentially issued under this clause (6) may not
                           exceed 400,000 shares (as adjusted for any
                           recapitalizations, stock splits or combinations of
                           the Common Stock or stock dividends on the Common
                           Stock to the extent paid in shares of Common Stock);
                           (7) in connection with leases; and (8) to former
                           employees in satisfaction of severance obligations of
                           the Corporation.

                                    (D) "First Issue Date" means the date on
                           which the first shares of Series A Preferred are
                           issued.

                                    (E) "Issue Date Market Price" means $3.92
                           (as adjusted pursuant to Section 6(a) and, to the
                           extent permissible under the rules and regulations of
                           the Principal Market, pursuant to Section 6(c)).

                                    (F) "Minimum Conversion Price" means (1) if
                           approved by the shareholders (and such approval is
                           sufficient, under the rules and regulations of the
                           Principal Market, to permit the conversion of Series
                           A Preferred at a conversion price not less than par
                           value), the par value of the Common Stock, or (2) if
                           otherwise, the Issue Date Market Price.

                  (e) Computation and Notice. Upon the occurrence of each
         adjustment of any Conversion Price pursuant to this Section 6, the
         Corporation will promptly compute such adjustment in accordance with
         the terms hereof and furnish to each holder of Series A Preferred
         affected thereby a certificate setting forth such adjustment and
         showing in detail the facts upon which such adjustment is based.




                                       11


                  (f) No Impairment. The Corporation will not, by amendment of
         its Articles of Incorporation or this Statement of Designations or
         through any reorganization, recapitalization, transfer of assets,
         consolidation, merger, dissolution, issue or sale of securities or any
         other voluntary action, avoid or seek to avoid the observance or
         performance of any of the terms to be observed or performed hereunder
         by the Corporation, but will at all times in good faith assist in the
         carrying out of all the provisions of this Statement of Designations
         and in the taking of all such action as may be necessary or appropriate
         in order to protect the conversion rights of the holders of Series A
         Preferred against impairment; provided, however, that this Section 6(f)
         will not apply to the issuance by the Corporation of the Senior
         Convertible Notes, shares of Series B Preferred or warrants issued to
         the purchasers of the Senior Convertible Notes and Series B Preferred.

         7. Redemption Rights. Subject to the limitations set forth in Section
8, the shares of Series A Preferred will be subject to redemption as follows:

                  (a) Interim Mandatory Redemption. On each of the eight (8)
         month, ten (10) month, twelve (12) month, fourteen (14) month, sixteen
         (16) month, eighteen (18) month, twenty (20) month and twenty-two (22)
         month anniversaries of the First Issue Date (each, an "Interim
         Redemption Date"), the Corporation will redeem a number of shares of
         Series A Preferred that is the lesser of (i) ninety-one thousand
         ninety-nine (91,099) shares of Series A Preferred and (ii) the number
         of shares of Series A Preferred outstanding on such Interim Redemption
         Date. All redemptions of less than all of the outstanding shares of
         Series A Preferred will be allocated pro rata among the holders of the
         outstanding shares of the Series A Preferred in proportion to the
         number of such shares then held by each such holder.

                  (b) Final Mandatory Redemption. On the two (2) year
         anniversary of the First Issue Date (the "Final Redemption Date"), the
         Corporation will redeem all shares of Series A Preferred outstanding on
         such date. The Interim Redemption Dates and the Final Redemption Date
         are referred to collectively as the "Redemption Dates" and each, as a
         "Redemption Date."

                  (c) Redemption Price. The redemption price to be paid by the
         Corporation for each share of Series A Preferred redeemed pursuant to
         this Section 7 (the "Redemption Price") will be the sum of (i) the
         Original Issue Price (as adjusted for any recapitalizations, stock
         splits or combinations of the Series A Preferred or stock dividends on
         the Series A Preferred to the extent paid in shares of Series A
         Preferred) and (ii) the amount of all Series A Preferred Dividends
         payable in respect of such share that have accumulated through the date
         of conversion but remain unpaid.

                  (d) Payment of the Redemption Price.

                           (i) Interim Redemption Dates.

                                    (A) The Redemption Price payable with
                           respect to each Interim Redemption Date will be
                           payable by the issuance by the





                                       12


                           Corporation of shares of Common Stock. The number of
                           shares of Common Stock to be issued to each holder of
                           Series A Preferred upon the redemption of shares of
                           Series A Preferred will be determined by dividing (1)
                           the aggregate Redemption Price owing to such holder
                           by (2) the Issue Date Market Price.

                                    (B) If the Corporation is prohibited by the
                           operation of Section 8 from issuing the full number
                           of shares of Common Stock to which holders of Series
                           A Preferred are entitled to receive upon a redemption
                           of Series A Preferred pursuant to Section 7(a), then
                           the Corporation will first issue the maximum number
                           of shares of Common Stock that it is permitted to
                           issue consistent with Section 8, and thereafter pay
                           the balance of the Redemption Price either, at the
                           Corporation's option, in cash or by the issuance of
                           an unsecured promissory note (the "Subordinated
                           Note") having a term of twelve (12) months, bearing a
                           rate of interest of six and one-half percent (6.50%)
                           and that is subordinated to the rights of the Senior
                           Convertible Notes; provided, however, that prior to
                           the payment in full of the Senior Convertible Notes,
                           the Corporation may issue only a Subordinated Note in
                           such circumstances.

                                    (C) If the Corporation is prohibited by the
                           operation of Section 8 from issuing the full number
                           of shares of Common Stock to which holders of Series
                           A Preferred are entitled to receive upon a redemption
                           of Series A Preferred pursuant to Section 7(a), and
                           the Corporation does not have sufficient funds or is
                           not permitted under applicable law to redeem the
                           shares of Series A Preferred required to be redeemed
                           on such Redemption Date in cash or by issuance of a
                           Subordinated Note pursuant to Section 7(d)(i)(B), the
                           Corporation will use all legally available funds to
                           effect such redemption in cash or by issuance of a
                           Subordinated Note. The Corporation will allocate the
                           shares of Series A Preferred to be redeemed ratably
                           among the holders of the outstanding shares of the
                           Series A Preferred in proportion to the number of
                           such shares then held by each holder. The shares of
                           Series A Preferred not redeemed will remain
                           outstanding and entitled to all of the rights and
                           preferences provided herein. Subject to the other
                           provisions hereof, the Corporation will redeem the
                           balance of the shares of Series A Preferred not
                           redeemed, by the payment of cash or issuance of a
                           Subordinated Note, on the first date thereafter on
                           which the Corporation may legally do so.

                           (ii) Final Redemption Date.

                                    (A) The Redemption Price payable with
                           respect to the Final Redemption Date will be payable,
                           at the option of the Corporation, by either (1) cash,
                           provided that the Corporation has sufficient funds
                           and is permitted under applicable law to redeem the
                           shares of Series A Preferred required to be redeemed
                           on the Final Redemption Date in cash, or (2) the
                           issuance by the Corporation of shares of Common
                           Stock. The





                                       13


                           number of shares of Common Stock to be issued to each
                           holder of Series A Preferred upon the redemption of
                           shares of Series A Preferred will be determined by
                           dividing (a) the aggregate Redemption Price owing to
                           such holder by (b) the lesser of the arithmetic mean
                           of the closing bid prices of the Common Stock on the
                           Principal Market on the five (5) trading days
                           immediately preceding the Final Redemption Date (the
                           "Final Redemption Market Price") or the Issue Date
                           Market Price; provided, however, that, unless the
                           Corporation has obtained the approval of its
                           shareholders of the issuance of shares of Common
                           Stock to the directors and officers of the
                           Corporation at a price less than the Issue Date
                           Market Price, if the Final Redemption Market Price is
                           less than the Issue Date Market Price, the Redemption
                           Price payable with respect to the Final Redemption
                           Date must be paid in cash.

                                    (B) If the Corporation is prohibited by the
                           operation of Section 8 from issuing the full number
                           of shares of Common Stock to which holders of Series
                           A Preferred are entitled to receive upon a redemption
                           of Series A Preferred pursuant to Section 7(b), then
                           the Corporation will first issue the maximum number
                           of shares of Common Stock that it is permitted to
                           issue consistent with Section 8, and thereafter pay
                           the balance of the Redemption Price in cash.

                                    (C) If the Corporation is prohibited by the
                           operation of Section 8 from issuing the full number
                           of shares of Common Stock to which holders of Series
                           A Preferred are entitled to receive upon a redemption
                           of Series A Preferred pursuant to Section 7(b), and
                           the Corporation does not have sufficient funds or is
                           not permitted under applicable law to redeem the
                           shares of Series A Preferred required to be redeemed
                           on such Redemption Date in cash pursuant to Section
                           7(d)(ii)(B), the Corporation will use all legally
                           available funds to effect such redemption in cash.
                           The Corporation will allocate the shares of Series A
                           Preferred to be redeemed ratably among the holders of
                           the outstanding shares of the Series A Preferred in
                           proportion to the number of such shares then held by
                           each holder. The shares of Series A Preferred not
                           redeemed will remain outstanding and entitled to all
                           of the rights and preferences provided herein.
                           Subject to the other provisions hereof, the
                           Corporation will redeem the balance of the shares of
                           Series A Preferred not redeemed, by the payment of
                           cash, on the first date thereafter on which the
                           Corporation may legally do so.

                  (e) Deferral of Interim Mandatory Redemptions. With respect to
         any redemption on an Interim Redemption Date, if the Issue Date Market
         Price is greater than the arithmetic mean of the closing bid prices of
         the Common Stock on the Principal Market on the five (5) trading days
         immediately preceding such Interim Redemption Date (the "Interim
         Redemption Market Price"), each holder of Series A Preferred will have
         the right, exercisable at such holder's option, to defer the redemption
         of such holder's shares of Series A Preferred scheduled to take place
         on such Interim Redemption Date until the






                                       14


         next succeeding Redemption Date. Subject to further application of this
         Section 7(e), on such next succeeding Redemption Date, the Corporation
         will be required to redeem the shares of Series A Preferred subject to
         such deferral of redemption in addition to any other shares of Series A
         Preferred required to be redeemed on such date pursuant to Section 7(a)
         or Section 7(b), as applicable. Each holder will be deemed to have
         exercised such holder's rights under this Section 7(e) whenever such
         rights are available unless such holder surrenders for redemption, as
         provided in Section 7(g), the certificates representing the shares of
         Series A Preferred within ten (10) days of the relevant Interim
         Redemption Date.

                  (f) Notice of Redemption. Promptly following each Redemption
         Date (but in no event later than three (3) business days following such
         date), the Corporation must give written notice (a "Notice of
         Redemption") to each holder of Series A Preferred. The Notice of
         Redemption will set forth (i) the Redemption Date, (ii) the aggregate
         number of shares of Series A Preferred to be redeemed on such date,
         (iii) the number of shares of Series A Preferred held by such holder to
         be redeemed on such date, (iv) the aggregate Redemption Price payable
         to such holder on such date, (v) the Issue Date Market Price, (vi) the
         Interim Redemption Market Price or the Final Redemption Market Price,
         as applicable, and (vii) the procedures to be followed by such holder
         to surrender for redemption the certificates representing the shares of
         Series A Preferred being redeemed.

                  (g) Procedure for Redemption. Subject to Section 7(e), upon
         receipt of such Notice of Redemption, each holder of Series A Preferred
         must promptly surrender the certificates evidencing the shares of
         Series A Preferred to be redeemed to the Corporation at the place
         designated in such Notice of Redemption. As promptly as practicable
         after certificates representing redeemed shares of Series A Preferred
         have been surrendered by a holder to the Corporation in accordance with
         the Notice of Redemption, the Corporation will issue and deliver to the
         holder a certificate or certificates for the number of full shares of
         Common Stock to which such holder is entitled and a check for cash with
         respect to any fractional interest as provided in Section 7(h). The
         holder will be deemed to have become a shareholder of record of Common
         Stock on the applicable Redemption Date unless the transfer books of
         the Corporation are closed on that date, in which event the holder will
         be deemed to have become a shareholder of record of Common Stock on the
         next succeeding date on which the transfer books are open. If fewer
         than the total number of shares of Series A Preferred represented by a
         certificate are redeemed, the Corporation will issue and deliver to the
         holder a new certificate representing the number of unredeemed shares
         of Series A Preferred.

                  (h) Fractional Shares. No fractional shares of Common Stock
         will be issued upon redemption of shares of Series A Preferred and the
         number of shares of Common Stock issued upon any redemption will be
         rounded down to the nearest whole share. Instead of issuing any
         fractional shares of Common Stock that would otherwise be issuable upon
         redemption of any shares of Series A Preferred, the Corporation will
         pay a cash amount in respect of such fractional interest equal to the
         fractional interest multiplied by the Issue Date Market Price. If the
         shares of Series A Preferred being redeemed by a holder at one time are
         represented by more than one certificate surrendered for redemption,
         the number of whole shares of Common Stock issuable upon





                                       15


         such redemption will be computed on the basis of the aggregate number
         of shares of Series A Preferred to be redeemed and represented by all
         such surrendered certificates.

                  (i) Rights in Preferred Stock Cease. From and after a
         Redemption Date, unless the relevant Redemption Price has not been paid
         or set aside for payment, all rights to undeclared dividends on the
         Series A Preferred being redeemed will cease and all other rights of
         the holders of such shares as holders of Series A Preferred (except the
         right to receive the Redemption Price without interest upon surrender
         of their certificate or certificates) will cease with respect to such
         shares, and such shares will not thereafter be transferred on the books
         of this Corporation or be deemed to be outstanding for any purpose
         whatsoever.

                  (j) Taxes. The Corporation will pay any and all issue and
         other taxes that may be payable in respect of any issue or delivery of
         shares of Common Stock on redemption of Series A Preferred pursuant
         hereto. The Corporation will not, however, be required to pay any tax
         that may be payable in respect of any transfer involved in the issue
         and delivery of shares of Common Stock in a name other than that in
         which the shares of Series A Preferred so redeemed were registered, and
         no such issue or delivery will be made unless and until the person
         requesting such issue has paid to the Corporation the amount of any
         such tax, or has established, to the satisfaction of the Corporation,
         that such tax has been paid.

                  (k) No Reissuance of Shares. All certificates of Series A
         Preferred surrendered for redemption will be appropriately canceled on
         the books of the Corporation, and the shares so redeemed will not
         thereafter be issuable by the Corporation.

         8. Limitation on Issuance of Common Stock Upon Conversion or
Redemption.

                  (a) Limitation on Issuance of Common Stock. Notwithstanding
         anything to the contrary set forth in Section 5 or Section 7, the
         Corporation may not issue more than eight hundred seventy thousand six
         hundred ninety-three (870,693) shares of Common Stock (as adjusted for
         any recapitalizations, stock splits or combinations of the Common Stock
         or stock dividends on the Common Stock to the extent paid in shares of
         Common Stock) (as adjusted, the "Maximum Number") upon (i) the
         conversion of shares of Series A Preferred pursuant to Section 5, (ii)
         the redemption of shares of Series A Preferred pursuant to Section 7,
         and (iii) the conversion or redemption of shares of Series B Preferred
         pursuant to the Statement of Designations of the Series B Convertible
         Preferred Stock of Zix Corporation.

                  (b) Shareholder Approval. The provisions of this Section 8
         will be null and void and of no further force and effect from and after
         the date on which the Corporation obtains the approval of its
         stockholders as required by the applicable rules of the Principal
         Market (or any successor rule or regulation) for issuances of shares of
         Common Stock in excess of the number of shares of Common Stock that the
         Corporation may issue without such approval upon Conversion Events (as
         defined below) without breaching the Corporation's obligations under
         the rules and regulations of the Principal Market.





                                       16


         "Conversion Events" means (A) the conversion of shares of Series A
         Preferred pursuant to Section 5, (B) the redemption of shares of Series
         A Preferred pursuant to Section 7, (C) the conversion or redemption of
         shares of Series B Preferred pursuant to the Statement of Designations
         of the Series B Convertible Preferred Stock of Zix Corporation, (D) the
         conversion of the Senior Convertible Notes and (E) the exercise of
         warrants issued to the purchasers of the Senior Convertible Notes on
         the First Issue Date.

         9. Reservation of Shares. The Corporation will at all times reserve and
keep available, out of its authorized but unissued Common Stock, solely for the
purpose of effecting the conversion and redemption of the Series A Preferred,
the number of shares of Common Stock that would be issuable upon the redemption
of all shares of Series A Preferred then outstanding at the Issue Date Market
Price. The Corporation will from time to time (subject to obtaining necessary
director and shareholder action), in accordance with the laws of the State of
Texas, increase the authorized amount of its Common Stock if at any time the
authorized number of shares of its Common Stock remaining unissued will not be
sufficient to permit the conversion of all of the shares of Series A Preferred
at the time outstanding or the redemption of all of the shares of Series A
Preferred to be redeemed on any Redemption Date (to the extent that the number
of shares of Common Stock issuable upon any such redemption has been fixed).

         10. Voting Rights.

                  (a) Voting Together With Common Stock. The holder of each
         share of Series A Preferred issued and outstanding will have the right
         to one vote for each share of Common Stock into which such share of
         Series A Preferred could be converted on the record date for the vote
         or consent of shareholders (or, if no record date is established, at
         the date such vote is taken or any written consent of shareholders is
         first solicited). Each holder of shares of Series A Preferred will be
         entitled to notice of any shareholders' meeting in accordance with the
         Bylaws of the Corporation. The holders of Series A Preferred will vote
         with the holders of the Common Stock (and the holders of shares of
         Series A Preferred will have voting rights and powers equal to those of
         the holders of the Common Stock) upon all matters upon which holders of
         Common Stock have the right to vote, except those matters required by
         law, the Articles of Incorporation or Section 10(b) to be submitted to
         a class or series vote. Fractional votes will not be permitted and any
         fractional voting rights available on an as-converted basis (after
         aggregating all shares of Common Stock into which shares of Series A
         Preferred held by each holder could then be converted) will be rounded
         to the nearest whole number (with one-half being rounded upward).
         Notwithstanding the foregoing, in no event will any share of Series A
         Preferred entitle the holder thereof to a number of votes that is
         greater than the number of votes that such holder would be entitled to
         if such holder converted such share of Series A Preferred into shares
         of Common Stock at a Conversion Price equal to the Original Issue Price
         (as adjusted for any recapitalizations, stock splits or combinations of
         the Series A Preferred or stock dividends on the Series A Preferred to
         the extent paid in shares of Series A Preferred).

                  (b) Special Voting Rights of the Series A Preferred. The
         Corporation will not take any of the following actions without first
         obtaining the approval (by vote or written consent in the manner
         provided by the Corporation Act) of the holders of at least a





                                       17


         majority of the total number of shares of Series A Preferred then
         outstanding, voting separately as a class:

                           (i) any amendment or alteration of or addition to the
                  Articles of Incorporation or this Statement of Designations
                  that has a material and adverse effect on the rights,
                  preferences or privileges of the Series A Preferred;

                           (ii) the designation or issuance of any series of
                  Senior Securities;

                           (iii) the redemption, retirement or repurchase of any
                  shares of Junior Securities;

                           (iv) the declaration or payment of any dividend
                  (other than a dividend payable solely in shares of Common
                  Stock) to the holders of any Junior Securities; or

                           (v) a Liquidation.

         11. Priority Upon Conversions and Redemptions. If, on any day, the
Corporation is unable to issue the full number of shares of Common Stock that
are issuable on such day upon any conversion or redemption of shares of Series A
Preferred and any Parity Securities, the Corporation will issue the number of
shares of Common Stock that it is able to issue ratably among the holders of the
Series A Preferred to be converted or redeemed and the holders of the Parity
Securities to be converted or redeemed in proportion to the full number of
shares of Common Stock to which each such holder would otherwise be entitled.
If, on any day, the Corporation is unable to pay the full amount of cash, or
issue the full original principal amount of Subordinated Notes, that is payable
or issuable on such day upon any conversion or redemption of shares of Series A
Preferred and any Parity Securities, the Corporation will pay the amount of
available cash, or issue Subordinated Notes with the maximum possible original
principal amount, ratably among the holders of the Series A Preferred to be
converted or redeemed and the holders of the Parity Securities to be converted
or redeemed in proportion to the full amount of cash or principal amount of
Subordinated Notes to which each such holder would otherwise be entitled.

         12. Corporation Action. At any time that any shares of Series A
Preferred are held by any director or officer of the Corporation, the
Corporation may not exercise any right, remedy, option or election that it may
have pursuant to this Statement of Designations unless (a) the material facts as
to each such director or officer's ownership of shares of Series A Preferred and
interest in the exercise of such right, remedy, option or election are disclosed
or are known to the Board or any committee thereof, and (b) the Board or any
such committee in good faith authorizes the exercise of such right, remedy,
option or election by the affirmative vote of a majority of the disinterested
directors, even though the disinterested directors may be less than a quorum.

         13. Notices. All notices, demands and other communications hereunder
must be in writing and will be deemed to have been duly given if delivered by
hand or express courier or when sent by facsimile transmission (with receipt
confirmed and a copy also sent by express courier), addressed (a) in the case of
a holder of the Series A Preferred, to such holder's address






                                       18


of record and (b) in the case of the Corporation, to the Corporation's principal
executive offices to the attention of the Corporation's Secretary.

         IN WITNESS WHEREOF, the Corporation has caused this Statement of
Designations of the Series A Convertible Preferred Stock of Zix Corporation to
be signed by its Senior Vice President and General Counsel on this 16th day of
September, 2002.


                                    /s/ Ronald A. Woessner
                                   --------------------------------------------
                                   Ronald A. Woessner
                                   Senior Vice President and General Counsel





                                       19