Disruption with some GitHub services

Incident Report for GitHub

Resolved

On September 23, 2025, between 15:29 UTC and 17:38 UTC and also on September 24, 2025 between 15:02 UTC and 15:12, email deliveries were delayed up to 50 minutes which resulted in significant delays for most types of email notifications. This occurred due to an unusually high volume of traffic which caused resource contention on some of our outbound email servers.

We have updated the configuration we use to better allocate capacity when there is a high volume of traffic and are also updating our monitors so we can detect this type of issue before it becomes a customer impacting incident.

Posted Sep 24, 2025 - 15:36 UTC

Update

We are seeing delays in email delivery, which is impacting notifications and user signup email verification. We are investigating and working on mitigation.

Posted Sep 24, 2025 - 14:55 UTC

Investigating

We are currently investigating this issue.

Posted Sep 24, 2025 - 14:46 UTC