Real-time email delivery metrics across major providers
Last updated: Aug 5, 2026 4:50 AM PDT
Current ESP Status
| Provider | P95 Latency (s) | Retry Rate | Trend | Status | Details |
|---|---|---|---|---|---|
| Apple iCloud | 3.13 | 1.5% | ▬ | Degraded | View Details |
| Comcast / Xfinity | 1.04 | 2.1% | ▼ | Healthy | View Details |
| GMX / WEB.de | 2.67 | 0.3% | ▲ | Healthy | View Details |
| Google Mail | 0.86 | 0.8% | ▲ | Healthy | View Details |
| Microsoft 365 | 2.47 | 0.4% | ▲ | Healthy | View Details |
| Outlook / Hotmail | 1.92 | 0.0% | ▲ | Healthy | View Details |
| Spectrum / Charter | 0.72 | 13.2% | ▬ | Issues | View Details |
| Yahoo / AOL | 1.23 | 0.0% | ▼ | Healthy | View Details |
Details for GMX / WEB.de
← Back to OverviewP95 Latency (24 hours)
Delivery Issues (24 hours)
Retry and Bounce RatesTop Delivery Failure Reasons (24 hours)
| Reason | Distribution |
|---|---|
| Unknown |
33.3%
|
| Invalid address (user doesn't exist) |
27.3%
|
| Mailbox over quota |
21.2%
|
| Temporary resource unavailable |
18.2%
|
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