You got **Sustained reported complaint rate is elevated** or **above 0.1%**. This uses ISP **feedback-loop** complaints only, as a share of **delivered** mail, across consecutive windows with enough volume.

It is not a complete inbox-placement score. Missing ISP coverage is not treated as a clean list.

0.1% is an error. ~0.08% is a warning. Inbox providers treat complaint rate as a primary reputation signal.

## What to change

1. Open **Settings → Deliverability** and inspect complaint windows.
2. Pause broad campaigns until you know who complained.
3. Make unsubscribe obvious and one-click. Buried unsubscribes become spam clicks.
4. Send to people who asked — drop purchased lists, old co-reg, and stale imports.
5. Tighten the audience: recent openers/clickers, or a confirmed segment, not the whole database.
6. Check subject/preview vs body. Surprise promo on a “receipt-looking” subject drives complaints.

Complained addresses are suppressed. Do not re-add them.

## After it recovers

The alert resolves after consecutive adequate windows stay below the warning threshold. Keep sending only to engaged, opted-in subscribers.

## Related

- [How to lower bounce rate](/docs/deliverability/how-to-lower-bounce-rate)
- [Content Deliverability Checker](/docs/features/content-deliverability)
- [Sender Health](/docs/features/sender-health)