
It’s provided to way to senders in keeping a clean list.
Senders should use feedback loops to listen to their subscribers and to take action (removing subscribers) if there are complaints.
FBLs are either IP-based or domain-based.
You can add the Feedback loops for your domains/IPs for major ISPs (i.e Gmail, Yahoo, Microsoft) as follows.
1. Gmail
2. Yahoo
3. Microsoft