What signals do Gmail and Yahoo share publicly (Postmaster, FBL)?;

You've sent a campaign and you're staring at your ESP's dashboard wondering how Gmail and Yahoo actually see you. Luckily, both providers give senders some visibility into that. Not full visibility, but enough to act on.

Gmail Postmaster Tools

Gmail's free Postmaster Tools dashboard shows you how Gmail sees your sending domain. Here's what each signal means in practice:

• Domain reputation is a four-level score (Bad, Low, Medium, High) that reflects how Gmail rates your sending domain based on user engagement, complaints, and spam patterns. Bad or Low means Gmail is actively routing your mail to spam. Medium is borderline. High is where you want to be.
• IP reputation works the same four-level scale but measures the IP address (or range) your mail is sent from. If you're on a shared IP at your ESP, a bad neighbor can drag this down even when your domain reputation is fine.
• Spam rate is the percentage of your Gmail-delivered email that users marked as spam. Gmail's own guidance flags anything above 0.10% as worth investigating and 0.30% as a serious problem. This is the number most senders should check first.
• Authentication results show your SPF, DKIM, and DMARC pass rates over time. A sudden dip here points to a configuration break, not a content or list problem.
• Delivery errors surface rate-limiting signals and rejection codes. Useful for catching infrastructure issues early.

One thing Gmail does not offer is an individual complaint feedback loop. You can't get a notification every time a Gmail user hits "Report spam." You only see aggregate spam rate data. That means you're watching trends, not individual signals.

Yahoo Complaint Feedback Loop (FBL)

Yahoo Mail (which also covers AOL Mail under the same program) runs a traditional Complaint Feedback Loop. When a recipient marks your email as spam, Yahoo sends a redacted copy of the original message to an address you register. This is individual-level complaint data, which means you can identify and suppress the specific subscriber who complained, rather than just watching a percentage move.

That distinction matters. Aggregate spam rates tell you something is wrong. Individual complaint data lets you fix it by removing the complainers before they build up and damage your reputation further.

What to actually do with these signals

• If your Gmail spam rate climbs above 0.10%, pause and look at your most recent sends. What changed? A new segment, a different subject line style, a purchased list? Find the source before sending more.
• If your Gmail domain reputation drops to Low or Bad, that's not a quick fix. You'll need to understand how Gmail's filtering responds to reputation recovery, which takes consistent low-complaint sending over weeks, not days.
• If your Gmail authentication results drop, run an email header check to find where the break is.
• For Yahoo FBL complaints, suppress every complainant immediately. Add them to your suppression list and never mail them again. That's the whole job.

Neither provider shares exactly why a specific email was filtered. The signals tell you outcomes, not the full reasoning. But that's still enough to catch problems early and fix what's actually in your control.

And if your domain reputation has already slipped and you're not sure where to start, our SOS hotline is free and we can help you work through it.