Document:

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                                                                    EXHIBIT 10.1

                                VOTING AGREEMENT

     This Voting Agreement (this "Agreement"), dated as of November 13, 2002, is
                                  ---------
entered into among Zix Corporation, a Texas corporation ("ZixCorp" or the
                                                          -------
"Company"), and the undersigned holders (the "Holders") of ZixCorp's Series A
 -------                                      -------
Convertible Preferred Stock, par value $1.00 per share (the "Series A
                                                             --------
Convertible Preferred Stock").
---------------------------

                                    RECITALS:

     WHEREAS, Section 10(a) of the Statement of Designations for the Series A
              -------------
Convertible Preferred Stock provides that the Series A Convertible Preferred
Stock has certain voting rights;

     WHEREAS, ZixCorp is soliciting proxies with respect to its shares of common
stock, par value $.01 per share (the "Common Stock"), in connection with a
                                      ------------
proposal ("Proposal One") to be considered by the shareholders of the Company at
           ------------
a meeting (the "Special Meeting") to approve the issuance of the Common Stock at
                ---------------
a price below the greater of book value or market price of the Common Stock (1)
to officers and directors of ZixCorp and other holders of the Series A
Convertible Preferred Stock upon conversion or redemption of the Series A
Convertible Preferred Stock and (2) in an amount equal to or greater than 20% of
ZixCorp's outstanding Common Stock immediately prior to the issuance of these
securities upon the conversion, redemption and/or exercise, as applicable, of
the ZixCorp Series A Convertible Preferred Stock, Series B Convertible Preferred
Stock, par value $1.00 per share, 6.5% Secured Convertible Notes and the
warrants associated with the 6.5% Secured Convertible Notes;

     WHEREAS, under the rules of the Nasdaq Stock Market, Inc., the approval of
Proposal One by the holders of Common Stock will not be valid if the shares of
Series A Convertible Preferred Stock (or shares of Common Stock received upon
conversion or redemption of the Series A Convertible Preferred Stock (such
shares of Common Stock, together with the Series A Convertible Preferred Stock,
the "Securities")) are eligible to vote in favor of Proposal One, and the
     ----------
Holders desire to confirm ZixCorp's understanding that the Holders are not
eligible to vote their Securities with respect to Proposal One; and

     WHEREAS, ZixCorp and the Holders desire to eliminate any ambiguity as to
whether or not the Securities are to be considered in determining whether
Proposal One receives the requisite shareholder vote for approval.

     NOW, THEREFORE, in consideration of the mutual premises contained herein,
the parties agree as follows:

     1. During the period (the "Agreement Period") beginning on the date hereof
                                ----------------
and ending on the earlier of (a) the consideration at a meeting of the holders
of Common

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Stock of Proposal One or (b) one year from the date hereof, each Holder hereby
severally agrees to cause its Securities (x) not to be present, in person or by
proxy, or voted for or against Proposal One at any meeting or meetings of the
shareholders of ZixCorp, and at any adjournments thereof, in which Proposal One
is submitted to the holders of Common Stock for approval or (y) not to execute
any written consent of the shareholders of ZixCorp regarding Proposal One.

     2. Nothing in this Agreement shall be construed as limiting the rights of
any Holder to vote at a meeting, in person or by proxy, or execute written
consents with respect to, (i) his or its shares of Common Stock that were not
issued upon conversion or redemption of such Holder's Series A Convertible
Preferred Stock, with respect to Proposal One or (ii) except as set forth in
Section 1, his or its shares of Common Stock or Series A Convertible Preferred
---------
Stock, with respect to any business (other than Proposal One) that is properly
brought before any meeting of the holders of Common Stock or any adjournment
thereof.

     3. Each Holder hereby represents and warrants to ZixCorp as of the date
hereof that such Holder (i) is the beneficial owner of the Securities set forth
opposite the Holder's name in Schedule A hereto, (ii) has the necessary legal
                              ----------
power, authority and right to enter into, execute and deliver this Agreement
without the consent or approval of any other person, and (iii) has not entered
into any voting agreement or other similar agreement with or granted any person
any proxy (revocable or irrevocable) in respect of the Securities (other than
this Agreement).

     4. If any provision of this Agreement shall be invalid or unenforceable
under applicable law, such provision shall be ineffective to the extent of such
invalidity or unenforceability only, without in any way affecting the remaining
provisions of this Agreement.

     5. This Agreement may be executed in two or more counterparts each of which
shall be an original with the same effect as if the signatures hereto and
thereto were upon the same instrument.

     6. This Agreement shall be governed by and construed in accordance with the
laws of the State of Texas (without reference to its conflict of laws rules).

     7. Each Holder will, upon request, execute and deliver any additional
documents deemed by ZixCorp to be reasonably necessary or desirable to complete
and effectuate the covenants contained herein.

     8. This Agreement shall terminate upon the termination of the Agreement
Period.

     9. No Holder shall sell, assign, encumber or otherwise dispose of, or enter
into any contract, option or other arrangement or understanding in respect of
the direct or indirect sale, assignment, transfer, encumbrance or other
disposition of, any Securities

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during the Agreement Period unless such Holder first obtains a written agreement
of the proposed transferee to be bound by the terms of this Agreement.

     10. Any Holder who is also a director of ZixCorp will not, by execution of
this Agreement, be precluded from exercising his fiduciary duties under
applicable law in his capacity as a director of ZixCorp.

     11. Nothing contained in this Agreement shall be deemed to vest in ZixCorp
any direct or indirect ownership or incidence of ownership of or with respect to
any Securities. All rights, ownership and economic benefits of and relating to
the Securities shall remain and belong to the applicable Holder and ZixCorp
shall not have any power or authority to direct any Holder in the voting of any
Securities or the performance by any Holder of its duties or responsibilities as
a shareholder of ZixCorp, except as otherwise provided herein.

            [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]

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     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date and year first above written.

                                   ZIX CORPORATION

                                   By:      /s/ Ronald A. Woessner
                                      -----------------------------------------
                                   Name:    Ronald A. Woessner
                                        ---------------------------------------
                                   Title:   S.V.P.
                                         --------------------------------------

                                   SERIES A INVESTORS

                                            /s/ John A. Ryan
                                   --------------------------------------------
                                   John A. Ryan

                                            /s/ David P. Cook
                                   --------------------------------------------
                                   David P. Cook

                                   SANTIG LTD., a Texas limited partnership
                                         By:    Sanchez Management Corp.,
                                                its general partner

                                   By:      /s/ A. R. Sanchez, Jr.
                                      -----------------------------------------
                                   Name:        A. R. Sanchez, Jr.
                                        ---------------------------------------
                                   Title:       President
                                         --------------------------------------

                                   1988 Spendthrift Trust

                                   By:      /s/ Frank A. Guerra
                                      -----------------------------------------
                                   Name:        Frank A. Guerra
                                        ---------------------------------------
                                   Title:       Trustee
                                         --------------------------------------

                                     /s/ A. R. Sanchez, Jr.
                                   --------------------------------------------
                                   A.R. Sanchez, Jr.

                                        4

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<TABLE>
<CAPTION>

                                   Schedule A
                                   ----------

       Name                                Securities
------------------          -----------------------------------
<S>                          <C>
John A. Ryan                 189,205 shares of Series A Convertible Preferred Stock

David P. Cook                71,809 shares of Series A Convertible Preferred Stock; 51,690 shares of
                             Common Stock

SANTIG, LTD.                 252,273 shares of Series A Convertible Preferred Stock

1988 Spendthrift Trust       126,136 shares of Series A Convertible Preferred Stock

A.R. Sanchez, Jr.            126,136 shares of Series A Convertible Preferred Stock
</TABLE><PAGE>

                                                                    EXHIBIT 10.2

October 1, 2002

Ronald A. Woessner
Zix Corporation
2711 N. Haskell Ave., Suite 2300
Dallas, TX 75204-2960

Re:  Amendment to Convertible Promissory Note

Dear Ron:

     Reference is hereby made to that certain Convertible Promissory Note, dated
July 11, 2001, made by Maptuit Corporation (the "Company") payable to ZixIt
Corporation (now Zix Corporation), a Texas corporation ("Zix"), in the principal
amount of US $2,000,000 (the "Note"). In connection with the Company's current
proposed sale and issuance of Series A-1 Convertible Preferred Shares (the
"Current Financing"), and as a condition to such Current Financing, Zix, the
Company, and Jeffrey P. Papows agree to the following (all amounts are in US
dollars):

     1.   Reduced Principal. - Zix shall not convert the Note as part of the
          Current Financing and the Note and the interest owing under the Note
          shall, subject to the terms of paragraph 2, be reduced to $900,000
          (the "Reduced Principal Amount"); provided, however, if the Company
          consummates an equity financing of $900,000 or more (other than
          pursuant to the Current Financing) from investors who do not
          participate in the Current Financing on or before January 1, 2003 (the
          "Subsequent Financing"), then as full payment for the principal and
          all accrued interest owing under the Note, the Company shall pay to
          Zix, and Zix agrees to accept, the Reduced Principal Amount. If an
          amount less than $900,000 is raised in a Subsequent Financing, then
          the parties will discuss what portion of that amount, if any, will be
          paid to Zix with respect to the Note. Furthermore, if the Company
          otherwise pays the Reduced Principal Amount prior to January 1, 2003,
          then Zix agrees to accept the Reduced Principal Amount as full payment
          for the principal and all accrued interest owing under the Note.
          Furthermore, if the Reduced Principal Amount has not already been
          fully paid (either pursuant to this paragraph 1 or otherwise), at such
          time as the Company has achieved positive cash flow for any fiscal
          quarter, the Company will pay Zix the lesser of $200,000 or 20% of the
          Reduced Principal Amount then owing within 15 business days of the end
          of such quarter to a total payment of $900,000.

          As additional consideration for Zix's agreements herein, within 10
          days from the closing of the Current Financing, (a) Mr. Papows will
          convey to Zix 1,000,000 (or equivalent) of his shares of common stock
          in the Company, subject to the proviso that if the Reduced Principal
          Amount is not paid on or by January 1, 2003, then Mr. Papows will
          convey an additional 1,000,000 (or equivalent) of such common stock
          shares to Zix and (b) the Company will pay or cause Zix to be paid
          $100,000 at the closing of the Current Financing.

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          The Company agrees that approximately $500,000 of loans to the Company
          from Company insiders will be converted into equity of the Company.
          The Company and Mr. Papows agree that the $200,000 ("Papows Insider
          Loan") of loans made to the Company by Mr. Papows will remain as a
          convertible note, but will not be repaid to Mr. Papows until the
          Reduced Principal Amount has been paid.

     2.   Full Note/Interest Payments. If the Note has not already been fully
          paid (either pursuant to paragraph 1 or otherwise) prior to (a) a
          Change in Control (as defined below), or (b) a Liquidation (as defined
          below), or (c) such time as the Company prepares to make or makes any
          payments on the "Papows Insider Loan", or (d) the current stated
          "Maturity Date" under the Note, then at Zix's election, (i) such of
          the Note (at the original $2,000,000 principal amount) excluding any
          and all interest minus any monies paid to Zix under this Agreement
          shall be paid by the Company to Zix in cash or (ii) such of the Note
          (at the original $2,000,000 principal amount) excluding any and all
          interest minus any monies paid to Zix under this Agreement shall
          convert into such number of common shares of the Company that is
          derived by dividing this amount by the current financing price of
          $0.071 per common share.

          A "Change of Control" shall mean the occurrence of (i) a merger,
          amalgamation, plan of arrangement, consolidation, or other transaction
          involving the Company whereby the holders of share capital of the
          Company immediately prior to such merger, amalgamation, plan of
          arrangement, consolidation, or other transaction hold, immediately
          following such merger, amalgamation, plan of arrangement,
          consolidation, or other transaction less than 50% by voting power
          (assuming for such purposes that the then-convertible Company
          non-voting securities have been converted into Company voting
          securities), of the share capital of the surviving corporation; or
          (ii) a purchase, tender, or exchange offer made to and accepted by the
          holders of more than 50% by voting power (assuming for such purposes
          that the then-convertible Company non-voting securities have been
          converted into Company voting securities), of the share capital of the
          Company; or (iii) the sale, in a single transaction or series of
          related transactions, by the Company of all or substantially all the
          assets of the Company. A "Liquidation" shall mean the occurrence of
          any liquidation, dissolution or winding up of the Company, either
          voluntary or involuntary (other than a liquidation, dissolution or
          winding up effected for the purpose of reincorporating the Company in
          another jurisdiction wherein the rights of Zix under the Note are not
          adversely affected).

     3.   Subordination - Subject to Zix's rights hereunder, Zix agrees that the
          Note and Reduced Principal Amount shall be subordinate in all respects
          to the Company's loan with MM Ventures and Pacific Business Funding
          (collectively, the "Lenders"), and shall execute any and all documents
          reasonably required by the Lenders and/or the Company.

     4.   Amendment - All other terms of the Note, including the current stated
          "Maturity Date," not expressly amended hereby shall remain in full
          force and effect.

     5.   Applicable Law - This letter agreement shall be interpreted and
          construed by the laws of the Province of Ontario (without giving
          effect to its conflict of laws rules) and the laws of Canada.

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     If you have any questions about the matters covered in this letter, please
call me.

                                            Very truly yours,

                                            MAPTUIT CORPORATION

                                                /s/ William K. Tapscott
                                            ------------------------------------
                                            Name:  William K. Tapscott
                                            Title: Secretary

                                                /s/ Jeffrey P. Papows
                                            ------------------------------------
                                            Jeffrey P. Papows

I have carefully read, fully understand and hereby agree to the terms and
conditions set forth above.

ZIX CORPORATION

  /s/  Ronald A. Woessner                            Date    10/2/02
-----------------------------                        ------------------
Name:  Ronald A. Woessner
Title:  S.V.P.

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