What are negative engagement signals for email? (e.g., spam complaints, deletes without opening)
Negative signals include spam complaints, deletes without reading, ignoring messages for long periods, and moving them from inbox to spam. The strongest and most damaging negative signal is when a user explicitly clicks This is spam.
Even a complaint rate as low as zero point one percent can begin to damage placement. That is one complaint per one thousand messages.
These patterns indicate unwanted mail.
Negative engagement is the shoreline going dark as recipients turn away from your ship.
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