This is one of the improvements in the latest updating of WebHat Newsletter, our software of e-mail marketing. This new feature allows to export the whole list of recipients of an e-mail marketing campaign and send them only another message.
You can achieve this functionality in the statistics page. At the end of the contacts list in the second tab, you will see the Utility button. Click it and view the menu items to execute the command.
Easy and useful tool to better target your results!