Email complaint rate calculator

Worked example

• Reported spam complaints: 8
• Provider-defined denominator: 4,000

Complaint rate · 0.2%

How to interpret the result

Use the denominator named by the provider. Some dashboards report complaints against inbox deliveries, so totals from different providers may be incomparable.

Publisher example

Five complaints against 2,500 provider-counted deliveries is 0.2%. Using 5,000 attempted sends instead would halve the figure without changing reader behavior.

Related reading: Yahoo spam complaint rate: use inbox deliveries as the denominator

Measurement reference: Yahoo Sender Hub best practices