Read my solution above, posted on 7/8/2016. We have been using this method to resend to clients that have not opened an email, or that we wish to resend again as a reminder. You can use this same method to send an existing email to a new list. Just open the list you want to send to, click the select all checkbox, go to quick send, select the email and send. Takes 1-2 minutes tops.
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