The Only Email Metrics That Actually Matter

Most email teams track too many metrics and optimize for the wrong ones. Here are the metrics that actually predict business impact. Revenue per email is the ultimate metric. It connects email activity directly to business outcomes. Track it by campaign, sequence, and individual email to identify your highest-performing content. List growth rate minus churn tells you whether your audience is expanding or contracting. A healthy list grows 3-5% monthly after accounting for unsubscribes and bounces. Click-to-open rate (CTOR) is more meaningful than raw click rate because it measures the relevance of your content to people who actually opened the email. Deliverability rate should be above 95%. Below that threshold, your sender reputation is at risk and all other metrics become unreliable. Unsubscribe rate per email should stay below 0.5%. Spikes indicate content-audience mismatch. Complaint rate must stay below 0.1% — this is the metric inbox providers care about most. Sequence completion rate shows what percentage of contacts finish your entire drip sequence versus dropping off. High drop-off at specific steps reveals content or timing problems.