Seems the Microsoft infrastructure is mostly back on track
Posted Nov 13, 2026 - 17:30 CET
Monitoring
Still today you will see transport error 421 to many Microsoft email boxes due the global outage which is still in process of being solved as we write.
Posted Nov 13, 2026 - 09:54 CET
This incident affected: Deliverability (hotmail.com, outlook.com).