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Fact-check summary

Reported by BleepingComputer; we couldn't independently corroborate via other outlets yet — story is recent.

1 caveat
  • ▲No matching reports or incident ID EX1331830 found in other credible coverage; Microsoft status pages currently show all services operational.
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via BleepingComputer

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Home/Tech/Microsoft Exchange Online Outage Hits Mail Flow in North America and Germany
VERIFIEDBy Xavier Rivera·Tuesday, June 2, 2026 at 1:20 PM AST·2 min read

Microsoft Exchange Online Outage Hits Mail Flow in North America and Germany

Microsoft is investigating a widespread Exchange Online outage disrupting mail flow for customers in North America and Germany. Users face significant sending and receiving delays with some messages undelivered for over an hour while engineers seek the root cause.

Source:BleepingComputer
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Microsoft Exchange Online Outage Hits Mail Flow in North America and Germany
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TL;DRAI · 60 sec read

Microsoft is addressing a widespread service issue that disrupts the mail flow pipeline for Exchange Online customers in North America and Germany. The outage causes SMTP deferral errors and leads to extensive delays or failures in email delivery. Engineers currently review reports to determine the root cause of this incident.

Story updates1 update
Jun 3, 5:26 PM ET

As of June 3, incident EX1331830 remains active and unresolved, affecting expanded regions including APAC and Europe. Microsoft is evaluating targeted service infrastructure resets as potential mitigation and analyzing mail queue backlogs for root cause.

Microsoft is working to address a widespread service issue affecting the mail flow pipeline for Exchange Online customers across North America and Germany. The company acknowledged the incident after a stream of user reports appeared on social media.

Incident tracked as EX1331830. Microsoft first acknowledged this incident at 10:33 EDT. It began investigating reports from users on social media at that time.

The company has classified this service outage as an incident. This classification typically applies to critical service issues with noticeable user impact.
Some affected users are seeing temporary SMTP deferral errors stating "The maximum number of concurrent connections per resource forest has exceeded a limit, closing transmission channel."

Specific error messages reported. Some affected users are seeing temporary SMTP deferral errors stating "The maximum number of concurrent connections per resource forest has exceeded a limit, closing transmission channel." Others see "Connection was closed abruptly (SuspiciousRemoteServerError)" messages.

These ongoing issues are affecting Exchange Online users trying to send or access their emails. This is resulting in extensive delays or failures.
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Extent of email delivery impact. Users are experiencing significant delays in sending and receiving email messages. Some email messages are remaining undelivered for over an hour, according to the company.

Microsoft said its engineers are currently reviewing reports to discover the root cause. The company issued the details in an admin center service alert.

Review of regional customer reports. The company is reviewing additional reports from customers in the North America and Germany regions. This work aims to further its understanding of the current impact scenario, isolate error messages affected users are receiving, and determine next troubleshooting steps.

In April Microsoft resolved Exchange Online mailbox access issues that had intermittently affected Outlook mobile and macOS users for weeks. It also resolved an Exchange Online outage that prevented users from accessing mailboxes and calendars via Outlook on the web, Outlook desktop, Exchange ActiveSync, and other Exchange Online connection protocols.
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More recently on Monday it addressed an outage that prevented Teams and Office for the web users from opening files. It also handled an incident that prevented customers from setting up multi-factor authentication or accessing the My Sign-Ins platform.

EXPERT TAKE

Admins should check the Microsoft 365 admin center service alert for EX1331830 and prepare for potential SMTP retry configurations during the ongoing incident.

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