JOINT FILING AGREEMENT
Exhibit 1
Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned
hereby agree, as of February 18, 2010, that only one statement containing the information required
by Schedule 13G, and each amendment thereto, need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of Zix Corporation, and such statement to which this
Joint Filing Agreement is attached as Exhibit 1 is filed on behalf of each of the
undersigned.
| ROCKALL EMERGING MARKETS MASTER FUND LTD. |
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| By: | Xxxxxxx Asset Management, LLC | |||
| its Investment Manager | ||||
| By: | /s/ Con Xxxx | |||
| Con Xxxx | ||||
| Manager | ||||
| XXXXXXX ASSET MANAGEMENT, LLC |
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| By: | /s/ Con Xxxx | |||
| Con Xxxx | ||||
| Manager | ||||
| CON XXXX |
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| /s/ Con Xxxx | ||||
| XXXXX X’XXXXXXXX |
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| /s/ Xxxxx X’Xxxxxxxx | ||||
| XXXXXX XXXXXXX |
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| /s/ Xxxxxx Xxxxxxx | ||||
