Real-time email delivery metrics across major providers
Last updated: Nov 11, 2026 5:40 PM PST
Current ESP Status
| Provider | P95 Latency (s) | Retry Rate | Trend | Status | Details |
|---|---|---|---|---|---|
| Apple iCloud | 4.49 | 0.0% | ▼ | Degraded | View Details |
| Barracuda | 0.98 | 0.0% | ▼ | Healthy | View Details |
| Comcast / Xfinity | 0.87 | 4.3% | ▬ | Healthy | View Details |
| GMX / WEB.de | 2.10 | 8.4% | ▬ | Degraded | View Details |
| Google Mail | 0.71 | 0.7% | ▬ | Healthy | View Details |
| Microsoft 365 | 1.69 | 0.7% | ▬ | Healthy | View Details |
| Mimecast | 6.12 | 25.9% | ▲ | Issues | View Details |
| Outlook / Hotmail | 1.59 | 0.0% | ▼ | Healthy | View Details |
| Proofpoint | 1.97 | 0.0% | ▼ | Healthy | View Details |
| Spectrum / Charter | 0.72 | 0.0% | ▬ | Healthy | View Details |
| Yahoo / AOL | 0.59 | 0.1% | ▬ | Healthy | View Details |
Details for Google Mail
← Back to OverviewP95 Latency (24 hours)
Delivery Issues (24 hours)
Retry and Bounce RatesTop Delivery Failure Reasons (24 hours)
| Reason | Distribution |
|---|---|
| Unknown |
97.4%
|
| DNS error (no MX/A record) |
1.2%
|
| Account disabled/inactive |
0.7%
|
| Invalid address (user doesn't exist) |
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