I was assuming that you're not sending the email to a long list of email addresses in the To or Cc field. If you do that, then a good many of your respondents will carelessly Reply All and let everyone see their answers. What you want is to send your list to one at a time, or to all of your victims at once using the Bcc field. That way no one can see who else is getting a copy of the survey, and they cannot accidentally Reply to any but you.
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