Definition
The percentage of recipients who mark your email as spam. Providers cap this very low, often around 0.1 to 0.3 percent, and exceeding it harms deliverability quickly.
Glossary
Spam complaint rate
The percentage of recipients who mark your email as spam. Providers cap this very low, often around 0.1 to 0.3 percent, and exceeding it harms deliverability quickly.
Related terms
- Feedback loopA service from a mailbox provider that tells senders when recipients mark mail as spam, so those addresses can be suppressed.
- Sender reputationA score mailbox providers assign to a sender based on past behaviour. Strong reputation lands you in the inbox; poor reputation sends you to spam.
- List-UnsubscribeAn email header that lets recipients unsubscribe directly from the inbox in one click. Providers increasingly require it for bulk senders.
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