@MaxLovell In Data&Analysis, make a Filter of Recipient Email
 

@Nam Nguyen I want to use the Qualatrics API and not to do this manually.

I don’t think you can do this directly. My best guess would be a search directory contacts call with an email filter to retrieve the contactId and then a contact history call. Parse the result to see if you get a response with your surveyId.

Thanks for the reply, that’s a shame. I don’t seem to be able to update contacts in my directories with new responses to surveys, Qualtrics just adds a new contact every time, which makes it a little fiddly to implement this, but good to have a workable option.

You might want to look into deduplication.