Real-time email delivery metrics across major providers
Last updated: Oct 21, 2025 8:30 PM PDT

Current ESP Status
Provider P95 Latency (s) Retry Rate Trend Status Details
Apple iCloud 2.53 0.0% Healthy View Details
Comcast / Xfinity 1.59 1.1% Healthy View Details
GMX / WEB.de 1.97 0.0% Healthy View Details
Google Mail 0.76 1.8% Healthy View Details
Microsoft 365 1.98 0.0% Healthy View Details
Outlook / Hotmail 1.63 0.0% Healthy View Details
Spectrum / Charter 0.76 0.0% Healthy View Details
Yahoo / AOL 1.48 0.0% 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
97.3%
Invalid address (user doesn't exist)
1.0%
Content rejected (spam/policy)
0.4%
Blocked (spam/virus/RBL/policy)
0.3%
Unknown
0.3%
Temporary resource unavailable
0.3%
Network error (timeout/refused/reset)
0.2%
Account disabled/inactive
0.2%

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.

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