Spam Complaint Rate

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Spam complaint rate is the proportion of recipients who mark your email as spam or junk. Even small increases in this metric can materially impact deliverability.

• Typical acceptable thresholds: Many senders aim to remain well below 0.1–0.3% complaints per send.

Key levers: Setting expectations up front, sending only to permission-based lists, providing easy unsubscribes, and maintaining relevance.

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