How to lower complaint rate
Stop mailing people who hit “this is spam” when reported complaints stay elevated.
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
- Open Settings → Deliverability and inspect complaint windows.
- Pause broad campaigns until you know who complained.
- Make unsubscribe obvious and one-click. Buried unsubscribes become spam clicks.
- Send to people who asked — drop purchased lists, old co-reg, and stale imports.
- Tighten the audience: recent openers/clickers, or a confirmed segment, not the whole database.
- 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.