That's a great question. Essentially, if you are passing the email through a mail merge system, the system will recognize that the link from that email has already been utililized and will trigger the error message. In this scenario, it is best to send to each individual recipient through Constant Contact or utilize the Survey URL, however, those responses will come back anonymous. Please feel free to reach out should you have other questions. Thank you for choosing Constant Contact. Have a great evening.
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