UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20529

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934
Exchange Act of 1934 (Amendment No.)

Filed by the Registrant þ

Filed by a Party other than the Registrant o

Check the appropriate box:

o		Preliminary Proxy Statement
o		Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
o		Definitive Proxy Statement
þ		Definitive Additional Materials
o		Soliciting Material Pursuant to §240.14a-12

ZIX CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

þ		No fee required.
o		Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

	1)		Title of each class of securities to which transaction applies:
	2)		Aggregate number of securities to which transaction applies:
	3)		Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
	4)		Proposed maximum aggregate value of transaction:
	5)		Total fee paid:

o		Fee paid previously with preliminary materials.
o		Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

	1)		Amount Previously Paid:
	2)		Form, Schedule or Registration Statement No.:
	3)		Filing Party:
	4)		Date Filed:

On April 29, 2011, Zix Corporation (“Company”) filed and mailed its definitive Proxy Statement (“Proxy Statement”) relating to its 2011 Annual Meeting of Shareholders to be held on Wednesday, June 8, 2011 at 10:00 a.m. Central Time at the Cityplace Conference Center, Turtle Creek I Room, 2711 North Haskell Drive, Dallas, Texas 75204. The following information was inadvertently omitted from the section entitled “Security Ownership of Directors, Management and Certain Beneficial Owners contained on pages 33 and 34 of the Proxy Statement as filed:

		Amount and Nature of
		Beneficial Ownership(1)
		Number of Common				Percentage of
		Stock Shares				Total Common Stock
Beneficial Owner		Beneficially Owned				Shares Outstanding(2)
Blackrock Inc. (3)			3,755,125				5.7	%