Provider
MailgunIncident detail
Microsoft Incident Resulting in Delivery Issues to M365
Resolved incidentMinor
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Timeline
Incident updates
Every update Mailgun posted, oldest to newest, exactly as it appeared on their official status page.
Monitoring
Starting around 08:00 UTC, Microsoft began experiencing an incident causing an increased volume of deferred emails across all M365 regions. The affected responses are returning "451 4.7.500 Server busy". Our teams are actively monitoring the situation. Sending to other email providers is not affected.
Monitoring
We are continuing to monitor for any further issues.
Resolved
Microsoft has resolved the underlying issue, we are seeing deliveries to M365 process normally.
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