Hi,
The email survey doesn’t support a second sending, so you need to make marketing emails work for you as a reminder email:
1. Make a list of Feedback submissions by survey name you are using. That will be your recipients don’t send to list.
2. Make a new marketing email and copy the contents of your feedback survey there. Add a button linking to the url of the survey which was in the original survey.
3. Send the email as you would do normally and put list of people who already answered the survey to the don’t send to field.
4. If you wish, you can make a workflow that automatically sends a reminder to the people who have not responded yet.
I hope this helps!