You can validate a message property after creating it by using the Validation tab on the Property Dictionary Item page.
To validate a message property
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                                                    Create a new message property. For instructions, see Creating a message property. 
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                                                    On the Property Dictionary Item page, click theValidation tab. 
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                                                    Click Validate and then select the Use Server Validation option. 
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                                                    From the drop-down menu, select the message property for which you are setting the server validation. 
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                                                    Click OK to save your changes to the message property.