Microsoft Confirms New Exchange Online Outage Delaying Emails from External Domains
Brief
Microsoft has confirmed a fresh Exchange Online incident, tracked as EX1467029, causing delays for users sending and receiving email messages from external domains.
The company first acknowledged the disruption on September 4, 2026, flagging it as a service degradation issue affecting Exchange Online, one of the most widely used business email platforms in the world.
According to Microsoft’s service health updates, the outage began around 3:49 PM GMT+5:30 and has continued through multiple status revisions issued that afternoon, with updates posted at 4:06 PM, 4:33 PM, and 5:56 PM.
Affected users have reported intermittent “Server busy” errors when attempting to communicate with recipients outside their own organization, a symptom that typically signals backend processing delays rather than a complete mail-flow failure.