A 0.3% spam rate means three user spam reports for every one thousand messages represented by Gmail Postmaster Tools. It is a ceiling to avoid, not a healthy operating target.
1. Aim below the warning level
Google recommends keeping user-reported spam below 0.1% and preventing it from reaching 0.3% or higher. Rates above 0.1% can already reduce delivery quality, especially when the pattern continues across multiple days.
2. Understand what the dashboard measures
Postmaster spam rate reflects messages delivered to engaged Gmail inboxes and then marked as spam. Messages already filtered to spam may not create the same denominator, so a low visible rate does not prove that all delivery is healthy.
3. Pause the source, not only the whole domain
Use campaign identifiers, From addresses and list segments to locate the complaint source. Pause that stream, remove unsupported data, confirm the offer and opt-out path, and avoid retrying the same audience from another IP.
4. Recover with recipient quality
Resume with the most engaged and clearly permissioned segment, lower volume and stable authentication. Watch the daily rate for at least a full reporting cycle before expanding again.
Implementation checklist
- Operational target below 0.1%
- Critical pause at 0.3%
- Complaint-heavy segment identified
- Unsubscribe path tested
- Suppression synchronized
- Resume volume controlled
Primary references
Share the sending domain, route, message purpose, expected volume and a recent received-message header.
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