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SuperOffice: Email delivery issues
SuperOffice · superoffice.comImpact: majorResolved2026-09-04 14:06 UTC
Public — what happened
Summary
Microsoft has confirmed the cause: an anti-spam detection model in Exchange Online was incorrectly enforcing throttling against a subset of legitimate senders, including SuperOffice, causing "Server busy" delays for messages sent to and from external domains.
Microsoft is rolling back the affected model and adding impacted sending IPs to an allow list as an interim mitigation. They estimate this rollout will complete within the next 30 minutes (as of their last update at 2:26 PM GMT+2), with their next update due by 4:30 PM GMT+2.
We expect email delivery to Microsoft 365/Outlook.com recipients to recover as this rolls out. No action is required on your end — delayed emails will continue t
Timeline
- Started — 2026-09-04 11:06 UTC
- Last update — 2026-09-04 14:06 UTC
- Resolved — 2026-09-04 15:48 UTC
With SquidGrid — where it starts on the route
Independent path health
The status page is the symptom. SquidGrid measures the paths that reach SuperOffice against their own baselines — whether the routes carrying your traffic degraded, at which handoff, and who owns that stretch.
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