Glossary

Email metrics

The numbers used to judge email: delivery, bounce, open, click, conversion, unsubscribe and complaint rates.

ValidReach Team · Updated 2026-10-26

In practice

Each is a ratio, so always note the denominator. Common ones: delivery rate = delivered ÷ sent; bounce rate = bounced ÷ sent; unsubscribe rate = unsubscribes ÷ delivered. Opens are the weakest because of image preloading.

Verification and sending

List quality shows up first in bounce and delivery rates, which move when you verify.