Real-time email delivery metrics across major providers
Last updated: Oct 1, 2025 3:05 PM PDT

Current ESP Status
Provider P95 Latency (s) Retry Rate Trend Status Details
Apple iCloud 2.75 0.4% Healthy View Details
Comcast / Xfinity 1.23 1.0% Healthy View Details
GMX / WEB.de 2.07 0.0% Healthy View Details
Google Mail 3.08 0.8% Degraded View Details
Microsoft 365 1.71 0.0% Healthy View Details
Outlook / Hotmail 1.59 0.0% Healthy View Details
Spectrum / Charter 1.12 0.0% Healthy View Details
Yahoo / AOL 1.48 0.1% Healthy View Details

Details for Google Mail

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P95 Latency (24 hours)
Delivery Issues (24 hours)
Retry and Bounce Rates
Top Delivery Failure Reasons (24 hours)
Reason Distribution
Mailbox over quota
96.0%
Temporary resource unavailable
1.5%
Invalid address (user doesn't exist)
1.4%
Network error (timeout/refused/reset)
0.6%
Unknown
0.4%
Account disabled/inactive
0.1%

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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