A feedback loop (FBL), sometimes called a complaint feedback loop, is an inter-organizational form of feedback by which an internet service provider (ISP) forwards the complaints originating from their users to the sender's organizations.

As a free benefit to our SMTP Relay Service customers, Unified eMail automatically parses all FBL requests and publishes the data into our Subscription Management tool for easy review and download.

Unified eMail subscribes to and activily monitors all the major feedback loops: