Positive engagement lifts reputation; negative engagement and inactivity lower it. Metrics are also how you decide who to keep sending to.
The metrics that matter#
- Authentication pass rate: share of mail passing SPF, DKIM, and DMARC alignment. Healthy: 99% or higher.
- Spam complaint rate: Gmail enforces at 0.3%; stay under 0.1%.
- Hard bounce rate: under 2%; above 5% triggers platform reviews.
- Inbox placement: above 90% across major providers via seed tests.
- Engagement: click and reply rates by segment; opens are unreliable after Mail Privacy Protection.
Where to read them#
- Google Postmaster Tools for Gmail domain reputation, spam rate, and authentication.
- Microsoft SNDS and JMRP for Outlook.com IP reputation and complaints.
- Your ESP's delivery and bounce reports.
- DMARC aggregate reports for authentication by source.
Improving the numbers#
- Track clicks and replies as primary metrics; opens are unreliable after Mail Privacy Protection.
- Set benchmarks per segment and channel rather than industry averages.
- Watch unsubscribe rate (aim under 0.5%) and complaint rate (under 0.1%).
- Feed engagement back into segmentation and sunset policies.
Frequently asked questions#
What is a good click-through rate?
2 to 5% for marketing email is common; transactional mail often exceeds 10%.