Where you saw it: A deliverability audit asking whether you are enrolled, a complaint rate you cannot explain, or reputation falling with no visible cause.
Why it happens
- Not enrolled. Each provider runs its own program and none of them enroll you automatically.
- Enrolled for the wrong IP or domain, so reports go somewhere you are not looking.
- Reports arriving and nobody processing them, which is worse than not receiving them.
- Google runs no per-message feedback loop for most senders, so Postmaster Tools is the substitute there.
The fix, in order
Enroll where a feedback loop exists
Yahoo's Complaint Feedback Loop covers Yahoo, AOL and the AT&T domains. Microsoft's Junk Mail Reporting Program covers their consumer estate. Both are free.
Use Postmaster Tools for Google
Google does not forward individual complaints to most senders. Their tools give aggregate complaint rates instead, and that is the number they enforce against.
Send reports to a processed mailbox
Reports arrive in a standard format. Point them at an address your platform can parse, not at a person who will stop reading them by Thursday.
Suppress complainers immediately
Anyone who reports a message must be suppressed at once. Sending again to a person who already pressed the spam button is the most avoidable reputation damage there is.
Trace complaints back to their source
Group them by campaign, signup source and list segment. Complaints cluster, and the cluster names the acquisition channel that is causing the problem.
How to know it worked
The short version
- Reports arrive from each provider you enrolled with.
- Complainers appear in your suppression list automatically.
- Complaint rate stays below 0.1% at Postmaster Tools and under 0.3% everywhere.
Questions people ask
Which providers offer a feedback loop?
Yahoo, covering AOL and the AT&T domains, and Microsoft for their consumer estate. Google does not run one for most senders and gives aggregate rates in Postmaster Tools instead.
What complaint rate is acceptable?
Below 0.1% is healthy. Google and Yahoo both name 0.3% as the ceiling, and at that level you are already being filtered.
Do I need one if I use a sending platform?
Many platforms enroll their shared IPs and process reports for you. On a dedicated IP or your own infrastructure it is yours to set up, and worth confirming rather than assuming.