Real-time email delivery metrics across major providers
Last updated: Sep 1, 2026 1:00 PM PDT
Current ESP Status
| Provider | P95 Latency (s) | Retry Rate | Trend | Status | Details |
|---|---|---|---|---|---|
| Apple iCloud | 3.95 | 0.0% | ▲ | Degraded | View Details |
| Comcast / Xfinity | 0.92 | 1.9% | ▼ | Healthy | View Details |
| GMX / WEB.de | 1.83 | 0.0% | ▬ | Healthy | View Details |
| Google Mail | 0.93 | 0.4% | ▬ | Healthy | View Details |
| Microsoft 365 | 1.79 | 0.9% | ▲ | Healthy | View Details |
| Outlook / Hotmail | 1.60 | 0.0% | ▬ | Healthy | View Details |
| Spectrum / Charter | 3.20 | 0.0% | ▲ | Degraded | View Details |
| Yahoo / AOL | 1.46 | 0.1% | ▲ | Healthy | View Details |
Details for Outlook / Hotmail
← Back to OverviewP95 Latency (24 hours)
Delivery Issues (24 hours)
Retry and Bounce RatesTop Delivery Failure Reasons (24 hours)
| Reason | Distribution |
|---|---|
| Invalid address (user doesn't exist) |
51.5%
|
| Temporary resource unavailable |
39.2%
|
| Unknown |
8.0%
|
| Network error (timeout/refused/reset) |
0.8%
|
| DMARC/authentication rejection |
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.
Need deeper, real-time insight?
- Query ANY domain - not just the majors you see above
- 1-minute granularity
- Slack / webhook alerts the moment a delivery issue arises
- Contact us for more details