Deliverability
What metric should I use to measure performance?
Updated Nov 6, 2026
ScaledMail recommends reply rate as the primary metric — not open rate.
Open tracking/pixels can hurt deliverability, so reply rate is the most reliable KPI.
Rough benchmarks:
- Under 1% — likely needs fixing
- 1–2% — okay, room to improve
- 2%+ — good
- 4%+ — exceptional
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