Unfortunately, some of your subscribers may click on the "this is a spam" button on their mail client instead of using your unsubscribe link.
That will negatively affect your reputation and if many users do the same action, your future messages may be redirected to the spam folder.
If you do not remove the user, next time he receives a message from you he may click on that "this is a spam" button again and affect one more time your reputation... so it's important to not send messages to that user any more.
But how to know who clicked on the "this is a spam" button?
We have a powerful bounce handling included in AcyMailing Enterprise...
The feedback loop can work only if you own a dedicated server with your own static IP.
You will have to register on different email service providers to receive the feedback loop report and make sure the feedback loop complaint is sent to your AcyMailing bounce e-mail address.
You can find more of them on the Wikipedia documentation but hereafter a list of providers we tested so we are sure they are working fine with Acy:
Mise à jour le Mercredi, 05 Décembre 2012 14:33