Hi @BEAC38 ,
Great question! With the survey/poll feature, recipients can currently respond multiple times with the same email address. We do have an open feature request, however, to limit responses to a single response per address. I can definitely tag that on your account and have our engineering team follow back up with any updates.
For now, as long as you are sending the invitation email for the survey/poll out directly through Constant Contact, it should tell you who took the survey. If they have taken the survey multiple times, I would just go ahead and manually delete all their secondary responses from the spreadsheet of results.
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