Open rate
Open rate is the share of delivered emails that subscribers opened. It's a rough signal of subject line strength and list health, not a precise count.
Open rate measures how many delivered emails were opened, expressed as a percentage. A newsletter sent to 1,000 readers and opened by 450 has a 45% open rate.
Treat it as a trend, not a truth. Privacy features like Apple's Mail Privacy Protection inflate opens, so the direction over time matters more than any single number.
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