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    Deliverability

    Spam Complaint Rate

    The percentage of recipients who clicked "report spam" instead of unsubscribing.

    Gmail will throttle senders with a complaint rate above 0.3%. Above 0.5% and your mail starts going straight to spam. The single biggest cause of complaints is people not remembering they signed up — a strong welcome email and consistent sending cadence are the best preventatives.

    Related terms

    Sender Reputation

    A score inbox providers assign to your sending domain and IP based on engagement, complaints, and bounces.

    Unsubscribe Rate

    The percentage of recipients who unsubscribe from a given campaign.