Week-long Exchange Online outage causes email failures, delays

Microsoft says it partially mitigated a week-long Exchange Online outage causing delays or failures when sending or receiving email messages. While the company didn't publicly share information on this incident, it tagged it as a critical service issue tracked under EX1027675 on the Microsoft 365 Admin Center. Microsoft has yet to share more information on what regions were affected by this outage, but it said the incident impacted "any user serviced by the impacted portion of infrastructure." Customers worldwide also reported experiencing email delivery failures over the last week, with those impacted saying they were receiving a Non-Delivery Report (NDR) with a "554 5.6.0 Corrupt message content" error. The company first acknowledged the Exchange Online email delivery issues on March 10, 11:14 AM, but the admin center incident report says the outage started on March 7, 12:30 PM UTC. "A recent service update, intended to improve our message transport services, introduced a code i ... Read full article.