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.