You can configure DeliveryByEMail within a survey to post a message back to an email address that the user entered as a response to a question.
- Include a required QuestionShortAnswer in the survey of type 'email'
- Its title MUST BE 'AutoReplyToAddress'
- Use DeliveryByEMail, with an empty TO address
- Set the DeliveryByEMail transform to 'email-text'
- Set the DeliveryByEMail mime type to 'text/html'
- Create a referenced HTML element in the survey with the title 'email-text' and include the message you want to deliver therein