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Delivery vs. deliverability is a useful distinction when reading email reports. Delivery commonly describes whether the receiving system accepted a message; deliverability concerns whether mail reaches the intended experience, often including inbox placement. Providers define metrics differently, so read their documentation before comparing numbers. Google explicitly notes that it cannot guarantee email-provider messages will pass Gmail’s spam filters. A high acceptance rate is not an inbox guarantee.
Trace the message through separate events
Distinguish submission to your provider, acceptance by the receiving server, a bounce or rejection, and any later evidence of engagement. The provider may not observe every stage. A successful API response can mean the provider queued the message, not that the customer received it. Keep event names accurate in dashboards and client reports.
Read the denominator and limitations
Check whether a rate uses attempted sends, accepted messages, eligible recipients or another population. Match the reporting window and message type. Open data can be affected by privacy features and automated activity; treat it cautiously. Do not infer exact inbox placement from an open rate or present two differently defined provider metrics as directly comparable.
Use evidence to choose a response
Review rejection codes, authentication results, complaint feedback and recipient consent. A delivery failure requires different investigation from an accepted message with little engagement. Improve content relevance and permission practices without trying to evade receiving-system protections. Follow provider sending requirements and suppression rules instead of repeatedly forcing messages to failed recipients.
A practical checklist
- Record each event’s definition.
- Name the metric denominator and time period.
- Separate acceptance from inbox placement.
- Review bounce, authentication and complaint evidence.
- State what the report cannot observe.
Worked example
Illustrative calculation: a service attempts 100 messages and records 98 receiver acceptances. That is 98 percent acceptance for those attempts, not proof that 98 people saw the messages in their inbox. Later engagement is a separate observation with its own limitations. The example is arithmetic, not a benchmark or a forecast for your campaigns.
Common questions
Does delivered always mean inbox? No. Does an API success prove receipt? Not necessarily. Can open rates measure exact human attention? No. Should one provider’s rate be compared with another? Only after reconciling definitions, populations and periods.
What to do next
Build reports that explain stages instead of collapsing them into one success percentage. Keep raw provider event meanings with the report. Clear definitions make troubleshooting more useful and prevent an impressive-looking number from overstating what was actually measured.