State of Email Deliverability
Aggregate data from every domain scored by the InbXr Signal Engine. What the deliverability landscape actually looks like, grade by grade, scored against the same 2025 ISP mandates every sender now has to meet.
Grade distribution
Every domain we've scanned, sorted by grade. The largest bucket is the category health snapshot: where most senders actually sit when measured against the full 7 Inbox Signals model.
Percentile thresholds
If your Signal Score is 80 and you're wondering whether that's good, these are the bands. A score at the P75 line puts you in the top quartile of scanned senders.
Score distribution (percentiles)
Most common failure modes
Where domains actually break. If you're in any of these buckets, fix this category first — it's where the biggest score gains live.
Signal average breakdown: Authentication Standing averages 59/100 across all scanned domains, and Domain Reputation averages 74/100.
Most frequently scanned domains
The domains our users look up the most. A proxy for which senders the market is most curious about.
| # | Domain | Score | Grade | Scans |
|---|---|---|---|---|
| 1 | redtea.com | 70 | C | 7 |
| 2 | goldco.com | 68 | C | 2 |
| 3 | middleamericanews.com | 65 | C | 1 |
What this tells us
- The average domain scores 71/100, which puts the median sender in the Grade C band — good enough to deliver, not good enough to consistently inbox.
- The gap between authentication and reputation tells you which half of the problem is more universal. When auth averages 59 and reputation averages 74, the category's weaker half is the lever you want to pull first.
- Only 25.0% of scanned domains achieve A or B grades. The top 10% of senders score 80+ — that's the actual bar for "best in class".
Where does your domain sit?
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