Real-time email delivery metrics across major providers
Last updated: Oct 27, 2026 7:00 AM PDT
Current ESP Status
| Provider | P95 Latency (s) | Retry Rate | Trend | Status | Details |
|---|---|---|---|---|---|
| Apple iCloud | 4.76 | 0.4% | ▲ | Degraded | View Details |
| Barracuda | 3.23 | 3.6% | ▲ | Degraded | View Details |
| Comcast / Xfinity | 7.70 | 9.0% | ▲ | Issues | View Details |
| GMX / WEB.de | 2.56 | 0.0% | ▲ | Healthy | View Details |
| Google Mail | 2.55 | 0.3% | ▲ | Healthy | View Details |
| Microsoft 365 | 1.81 | 0.4% | ▲ | Healthy | View Details |
| Mimecast | 1.66 | 34.1% | ▲ | Issues | View Details |
| Outlook / Hotmail | 1.77 | 0.1% | ▲ | Healthy | View Details |
| Proofpoint | 4.07 | 5.4% | ▲ | Degraded | View Details |
| Spectrum / Charter | 6.58 | 0.0% | ▲ | Issues | View Details |
| Yahoo / AOL | 1.32 | 0.6% | ▬ | 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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