Real-time email delivery metrics across major providers
Last updated: Oct 21, 2026 7:05 PM PDT
Current ESP Status
| Provider | P95 Latency (s) | Retry Rate | Trend | Status | Details |
|---|---|---|---|---|---|
| Apple iCloud | 2.33 | 0.3% | ▬ | Healthy | View Details |
| Barracuda | 0.99 | 0.0% | ▲ | Healthy | View Details |
| Comcast / Xfinity | 0.85 | 8.2% | ▬ | Degraded | View Details |
| GMX / WEB.de | 2.09 | 0.0% | ▬ | Healthy | View Details |
| Google Mail | 0.69 | 1.0% | ▬ | Healthy | View Details |
| Microsoft 365 | 1.82 | 3.2% | ▲ | Healthy | View Details |
| Mimecast | 0.97 | 43.8% | ▬ | Issues | View Details |
| Outlook / Hotmail | 1.45 | 0.0% | ▬ | Healthy | View Details |
| Proofpoint | 0.99 | 8.5% | ▬ | Degraded | View Details |
| Spectrum / Charter | 1.31 | 0.0% | ▬ | Healthy | View Details |
| Yahoo / AOL | 0.58 | 0.0% | ▬ | Healthy | View Details |
Details for Mimecast
← Back to OverviewP95 Latency (24 hours)
Delivery Issues (24 hours)
Retry and Bounce RatesTop Delivery Failure Reasons (24 hours)
| Reason | Distribution |
|---|---|
| Unknown |
99.9%
|
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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