How do I turn off the Bounce Re-Delivery System
The Bounce Re-Delivery System is turned on by default, and will send your subscribers a followup message anytime their ISP mistakenly blocks a message, because they think it's spam. In addition, the list owner will be sent a summary report showing all the subscribers affected by this problem.
The email to the subscriber will point them to a web page containing the last 2 weeks of your messages. So they may read any message(s) that they missed.
You may turn off this feature if you wish.
Log into your Mail-List.com account from https://database.mail-list.com and click on "Customize Your List".
Click the Reports Section to expose all of those option.