Email glossary · Practical guide
Email delivery rate: define accepted, bounced and unknown outcomes
Delivery rate needs an explicit operational definition. A common non-bounce calculation describes observed failures against a send cohort, not confirmed inbox placement for every message.
Reviewed · Examples are illustrative
Who this helps: Readers checking a term before making an outreach or mailbox decision.
Meaning and common confusion
Choose a fixed message cohort and observation cutoff. Distinguish rejected submissions, accepted messages, later bounces and uncertain attempts. If a dashboard calls the remainder delivered, explain that definition rather than letting readers infer a verified recipient action.
Worked example
This is a synthetic illustration, not a customer result or a live configuration to copy.
Accepted cohort: 200 messages
Observed bounces by cutoff: 10
Non-bounced remainder: 190 / 200 = 95%
This is a defined non-bounce rate, not a verified 95% inbox-placement rate.Checks to make
- Keep message counts separate from unique people.
- Record delayed bounce revisions.
- Do not silently classify uncertain attempts as successful delivery.
Next step and limits
Use the sent-versus-delivered denominator guide when reports disagree. The correct formula depends on the chosen cohort and statuses. Zintara's sent records and provider evidence should be reconciled before making a delivery claim.
Source: Zintara product context for this operational definition
Source references
Worked examples are illustrative. Editorial procedures are suggested methods, not measured performance claims or promises of additional product features.
Related guides
- Sent versus delivered denominators: label what your reply rate means →
- Cold email bounce rate calculation: reconcile failures with the send cohort →