What complaint feedback loops are#
Feedback loops (FBLs) are programs run by mailbox providers (Microsoft JMRP, Yahoo CFL, Comcast, and others) that send you a copy or notice whenever a recipient marks your message as spam.
Why it matters#
Complaints are the strongest negative signal. FBLs let you suppress complainers immediately and detect problem campaigns before reputation collapses.
Getting started#
- Register your sending IPs and domains with each provider's FBL.
- Route FBL messages to an automated parser.
- Suppress every complainer from all future marketing.
- Report complaint rate per campaign and per acquisition source.
Common mistakes#
- Registering but never processing the reports.
- Gmail has no traditional FBL; use Postmaster Tools spam rate instead.
Frequently asked questions#
Does Gmail offer a feedback loop?
Only an aggregate one via Postmaster Tools using the Feedback-ID header. Gmail does not return individual complaints.