If you’d like to export a CSV or Excel file of recipients who have unsubscribed from your MergeMail campaigns, you can do so using MergeMail Reports.
First, go to Reports and click on Recipients. Then enable the “Unsubscribed” filter. The report will now show all of the recipients who have unsubscribed from your MergeMail campaigns. To export these recipients, click on the “Download” button at the bottom of the page, then choose to download the list as either a CSV or an Excel file.