Users may experience delays when sending or receiving Exchange Online email messages
ID: EX1224375
Issue type: Incident
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Impacted services
Exchange Online
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Details
Title: Users may experience delays when sending or receiving Exchange Online email messages
User impact: Users may experience delays when sending or receiving Exchange Online email messages.
More info: This issue specifically impacts users who are on Simple Mail Transfer Protocol (SMTP) connection methods, which include Outlook on the web, the Outlook desktop clients, and the mobile apps.
Current status: Our investigation has further identified that exceptions may be occurring as our mail transport service is sending an unexpectedly large amount of requests to downstream components in the mail routing code path. We're investigating recent changes to confirm this theory and determine next steps for remediation.
Scope of impact: Some users attempting to send or receive Exchange Online email messages may be impacted.
Next update by: Friday, January 30, 2026, at 7:30 PM UTC
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