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Sender is User picker field where you can select jira-user who's name will be displayed in Sender e-mail field (From). If no user is selected, e-mail will be sent from 'Robot Inspector'. Anyway sender's e-mail will be as set in System/ Outgoing mail.
Post-function's attributes
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You can configure which custom fields will be presented on this particular transition in this particular project. If no fields are selected in postfunction, the customer will receive default survey from Customer Satisfaction HelpDesk Admin menu.Scheme. Select a customer's satisfaction scheme from dropdown list of schemes created in HelpDesk administration / Customer Satisfaction