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Glossary · Published 2026-09-29 · AgentiSend team

Complaint rate

Complaint rate: The share of delivered mail that recipients mark as spam, judged by the ladder.

A complaint is a recipient marking the message as spam. The rate is complaints over mail that was delivered, inside the trust window of 7 days.

The enforcement ladder warns at 0.05% and pauses at 0.08%. A feedback loop report is one way a complaint arrives.

Related terms

  • Enforcement ladder — Warn, then pause, on bounce rate and complaint rate. One step per check.
  • Feedback loop — A mailbox provider's notice that a recipient marked the message as spam.