Microsoft is looking into another global outage that has impacted Exchange Online, its cloud-based email system.

The Microsoft 365 Status Twitter feed reported “impact is specific to users who are served through the affected infrastructure in North America, Europe, and the United Kingdom.” The thread continues,  “We’re investigating an issue wherein users may be unable to access their Exchange Online mailboxes via any connection method. Additional details can be found within the Service Health Dashboard under EX522020,”

Reports from customers on Twitter suggest that a large quantity of emails sent to Exchange Online mailboxes are not being received.  “Users are reporting receiving an error including “550 5.4.1 Recipient address rejected: Access denied” and we are investigating further.”

At 5:22 PM UTC, Microsoft announced that they had detected an issue with Directory Based Edge Blocking (DBEB), and they are looking into it further.

Microsoft 365 Status then tweeted: “We’ve confirmed that rerouting EOP traffic to alternate infrastructure has resolved the user impact.”

Earlier this year Microsoft experienced a similar global interruption. A router IP address alteration in late January led to packet forwarding difficulties between routers in the Microsoft Wide Area Network (WAN) that caused a global shutdown of several Microsoft 365 services. January’s service disruption impacted Microsoft Teams, Exchange Online, Outlook, SharePoint Online, OneDrive, the Microsoft 365 Admin Center, and some Microsoft Defender items.

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