Real-time email delivery metrics across major providers
Last updated: Jan 10, 2026 9:05 AM PST
Current ESP Status
| Provider | P95 Latency (s) | Retry Rate | Trend | Status | Details |
|---|---|---|---|---|---|
| Apple iCloud | 3.10 | 0.0% | ▲ | Degraded | View Details |
| Comcast / Xfinity | 1.36 | 4.3% | ▲ | Healthy | View Details |
| GMX / WEB.de | 1.79 | 0.0% | ▬ | Healthy | View Details |
| Google Mail | 0.62 | 0.6% | ▬ | Healthy | View Details |
| Microsoft 365 | 1.58 | 0.5% | ▬ | Healthy | View Details |
| Outlook / Hotmail | 1.82 | 0.0% | ▲ | Healthy | View Details |
| Spectrum / Charter | 0.77 | 0.0% | ▬ | Healthy | View Details |
| Yahoo / AOL | 1.46 | 0.0% | ▬ | Healthy | View Details |
Details for Google Mail
← Back to OverviewP95 Latency (24 hours)
Delivery Issues (24 hours)
Retry and Bounce RatesTop Delivery Failure Reasons (24 hours)
| Reason | Distribution |
|---|---|
| Mailbox over quota |
94.8%
|
| Content rejected (spam/policy) |
1.6%
|
| Rate limited |
1.5%
|
| Invalid address (user doesn't exist) |
1.5%
|
| Account disabled/inactive |
0.5%
|
About this data
- The numbers on this page come from SMTP telemetry that Groups.io collects each day.
- Latency measures the time from the start of the connection until we receive the server's response to the DATA command.
- Metrics are updated every five minutes and down-sampled into 5-minute buckets; raw data older than seven days is automatically purged, and roll-ups are kept for 90 days.
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- Query ANY domain - not just the majors you see above
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