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Title: Users may be experiencing significant delays or failures in sending and receiving email messages in Exchange Online User impact: Users may be experiencing significant delays or failures in sending and receiving email messages in Exchange Online More info: At this time, we’re not seeing delays in sending and receiving email messages. We'll continue to monitor service health and take any necessary actions to remediate residual impact. Affected users may receive a 421 4.3.2 error code that states "Cannot establish session with remote server." Current status: Our transition to the functional legacy mechanism across the affected infrastructure has completed successfully. This change will help distribute email traffic more evenly across the service and adds additional resiliency to the impacted environment. In our review of system logging we've identified a configuration issue that prevented some Exchange email delivery systems from properly distributing traffic load, which is a likely source of underlying impact. We are continuing to validate this potential root cause. Current telemetry indicates that email sending and delivery services continue to remain stable with no observable impact. We’ll continue monitoring to ensure service stability through peak North America business hours. Scope of impact: Impact is specific to users located in North America, Europe, or the Asia-Pacific regions attempting to send and receive email messages in Exchange Online who may experience delays or failures completing these actions. This section may be updated as the investigation progresses. Start time: Tuesday, June 02, 2026, at 1:03 PM UTC Preliminary root cause: A configuration issue prevented some Exchange email delivery systems from properly distributing traffic load, reducing available capacity in several regions and causing increased traffic on remaining systems, which resulted in email delivery delays and disruptions. Next update by: Wednesday, June 03, 2026, at 6:00 PM UTC

Last update on Jun 03, 2026 4:38 PM