Add the question with the form field.

Set the validation as email address

Set a workflow as below.

In the email section to address pipe like this

Hope this works.

@ZoeRobo 

1. Add a text entry question at the end, make sure to validate for email

   

2. Create a workflow which triggered by a survey response
3. Add a email task and pip-text the 1st step text entry for destination

   

Hope this helps

Thank you @praveengeorgeix  and @dxconnamnguyen 

Is there a difference between using a form field, or a type question to capture the email, using both of your instructions respectively? 

Both solutions in this case seem to work well! 

Thanks 

zoe 

The difference is mostly cosmetic, the 2 question types will render differently but in terms of functionality you can achieve the same with both.

Form would be better in a situation where you want to ask for multiple fields at the same time, say you’d want names, phone numbers or other fields to include in your thank you note.

No difference in functionality, don’t get confused. We just reply to your post at the same time and somehow it’s different in question type 

Like what @vgayraud said, it’s mostly cosmetic. Try both of them and decide what you like