What is the industry standard for complaint feedback loops?

Industry standard for complaint feedback loops involves registering with major providers (Microsoft JMRP, Yahoo CFL, and others) to receive notifications when recipients mark your messages as spam. Reports typically arrive in ARF (Abuse Reporting Format).

FBL registration requires domain ownership verification and specifying where reports should be sent. Most ESPs handle FBL integration automatically, processing reports and suppressing complainers.

Best practice includes processing all available FBLs, not just major ones. Some regional providers and corporate systems offer feedback loops. Broader FBL coverage provides more complete complaint visibility.