Get Email Trigger Input
Retrieve the message key of the email that triggered the wizard and place it into a new or existing variable.
This command is relevant only for a wizard initiated by an email trigger (as configured in Nintex Console)
The message key retrieved is used in conjunction with the Get Email Messages command
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                                                    Indicate if you wish to retrieve the message key of the email that triggered the wizard and enter the name of the variable into which to place it