Real-time email delivery metrics across major providers
Last updated: Nov 3, 2026 6:40 AM PST
Current ESP Status
| Provider | P95 Latency (s) | Retry Rate | Trend | Status | Details |
|---|---|---|---|---|---|
| Apple iCloud | 2.36 | 0.0% | ▬ | Healthy | View Details |
| Barracuda | 1.44 | 0.6% | ▬ | Healthy | View Details |
| Comcast / Xfinity | 0.92 | 2.8% | ▬ | Healthy | View Details |
| GMX / WEB.de | 1.93 | 0.0% | ▬ | Healthy | View Details |
| Google Mail | 0.79 | 0.4% | ▼ | Healthy | View Details |
| Microsoft 365 | 1.68 | 0.2% | ▬ | Healthy | View Details |
| Mimecast | 1.54 | 39.7% | ▬ | Issues | View Details |
| Outlook / Hotmail | 1.63 | 0.0% | ▬ | Healthy | View Details |
| Proofpoint | 1.39 | 0.0% | ▼ | Healthy | View Details |
| Spectrum / Charter | 1.33 | 0.0% | ▬ | Healthy | View Details |
| Yahoo / AOL | 1.32 | 0.0% | ▲ | Healthy | View Details |
Details for Microsoft 365
← Back to OverviewP95 Latency (24 hours)
Delivery Issues (24 hours)
Retry and Bounce RatesTop Delivery Failure Reasons (24 hours)
| Reason | Distribution |
|---|---|
| Unknown |
95.5%
|
| DNS error (no MX/A record) |
3.8%
|
| Network error (timeout/refused/reset) |
0.7%
|
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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