Outage in Microsoft 365
Some users may be intermittently unable to send email messages to Outlook.com, Hotmail.com, or Live.com email addresses
Resolved Minor
November 06, 2026 - Started 4 days ago
- Lasted 3 days
Incident Report
Summary AI Generated
**Microsoft 365 – Exchange Online Email Delivery Issue** Some Microsoft 365 users experienced intermittent failures when sending emails to Outlook.com, Hotmail.com, and Live.com addresses, with failed messages returning NDR errors 550 5.7.1 or 550 5.7.23 due to SPF violations. The incident affected Exchange Online and persisted for over 83 hours. Microsoft is actively investigating the root cause and collecting diagnostic logs from affected users to identify a remediation plan.
Title: Some users may be intermittently unable to send email messages to Outlook.com, Hotmail.com, or Live.com email addresses
User impact: Users may be intermittently unable to send email messages to Outlook.com, Hotmail.com, or Live.com email addresses.
More info: Users may receive a Non-Delivery Report (NDR) reporting 550 5.7.1 or 550 5.7.23 due to Service Provider Foundation (SPF) violation.
Current status: We've received reports indicating that some users may be unable to send email messages to Outlook.com, Hotmail.com or Live.com email addresses. We're requesting that affected users reach out to their support representatives and provide fresh Network Message IDs, fresh logs, and examples of impact users are facing in .eml format. These logs will aid in the root cause investigation into why impact persists, so we can identify a remediation plan.
Scope of impact: Some users may be intermittently unable to send email messages to Outlook, Hotmail, and Live email accounts.
Next update by: Wednesday, November 11, 2026, at 7:00 AM UTC
User impact: Users may be intermittently unable to send email messages to Outlook.com, Hotmail.com, or Live.com email addresses.
More info: Users may receive a Non-Delivery Report (NDR) reporting 550 5.7.1 or 550 5.7.23 due to Service Provider Foundation (SPF) violation.
Current status: We've received reports indicating that some users may be unable to send email messages to Outlook.com, Hotmail.com or Live.com email addresses. We're requesting that affected users reach out to their support representatives and provide fresh Network Message IDs, fresh logs, and examples of impact users are facing in .eml format. These logs will aid in the root cause investigation into why impact persists, so we can identify a remediation plan.
Scope of impact: Some users may be intermittently unable to send email messages to Outlook, Hotmail, and Live email accounts.
Next update by: Wednesday, November 11, 2026, at 7:00 AM UTC
Components affected
Exchange OnlineTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
1 day ago - at 11/09/2026 05:24AM
Title: Some users may be intermittently unable to send email messages to Outlook.com, Hotmail.com, or Live.com email addresses
User impact: Users may be intermittently unable to send email messages to Outlook.com, Hotmail.com, or Live.com email addresses.
More info: Users may receive a Non-Delivery Report (NDR) reporting 550 5.7.1 or 550 5.7.23 due to Service Provider Foundation (SPF) violation.
Current status: We've received reports indicating that some users may be unable to send email messages to Outlook.com, Hotmail.com or Live.com email addresses. We're requesting that affected users reach out to their support representatives and provide fresh Network Message IDs, fresh logs, and examples of impact users are facing in .eml format. These logs will aid in the root cause investigation into why impact persists, so we can identify a remediation plan.
Scope of impact: Some users may be intermittently unable to send email messages to Outlook, Hotmail, and Live email accounts.
Next update by: Wednesday, November 11, 2026, at 7:00 AM UTC
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