Free tool
Spam Complaint Rate Calculator
Enter delivered emails and spam complaints to get your complaint rate and a verdict against Gmail and Yahoo's 0.3% hard limit. Advanced mode breaks it down per provider.
How it works
- 1Enter emails delivered and spam complaints received.
- 2We calculate your complaint rate as a percentage.
- 3See whether you're under the 0.1% target and the 0.3% hard limit.
Questions
Frequently asked
What complaint rate is too high?
Gmail and Yahoo require senders to stay under 0.3%, and ideally below 0.1%. Cross 0.3% and your mail starts getting throttled or blocked.
How do I lower complaints?
Send only to people who opted in, make unsubscribe easy, and remove unengaged and unverified addresses — stale lists drive complaints.
Can I check a whole list at once?
This free tool checks one at a time. To verify a full list — email, phone and company together — upload a CSV to BounceBlock and preview your first 100 rows free.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.
100 free creditsNo credit cardCancel anytime