University of Nebraska incident
Microsoft 365 email delivery under investigation
Resolved after 3 days, affecting Microsoft 365 - Outlook (Exchange Online), on August 14, 2026.
Our email security provider has resolved the underlying issues affecting email routing. All email services are now functioning as expected. Messages that you sent between 6:00am and 10:00 am, especially those that you received an email bounce back message on, were likely not delivered and will need to be resent. Senders from outside of the NU System, including UNMC, sending you email may also need to resend their messages to you. Email sent between internal campus accounts was not impacted by this outage.
Affected components
Update timeline
- investigating Aug 14, 2026, 01:06 PM UTC
A problem with outbound email from Microsoft 365 is under investigation. Technicians are investigating the issue. Questions 402-472-3970 or [email protected]
- identified Aug 14, 2026, 01:28 PM UTC
As a result of a global outage with our email security provider, inbound and outbound email is currently disrupted. Attempts may result in email bounce messages. Internal emails within the @nebraska.edu tenant are still functional during this disruption.
- identified Aug 14, 2026, 02:17 PM UTC
Due to a global outage affecting our email security provider, Proofpoint, inbound and outbound email is currently disrupted and some messages may bounce. Internal email within the NU System—including UNO, UNK, UNL and the Office of the President—remains functional. UNMC is not impacted by the outage; however, messages sent from other campuses to UNMC addresses may bounce. Emails generated by Zoom, Canvas and other third-party applications may also be affected. Proofpoint is working to resolve the issue.
- monitoring Aug 14, 2026, 03:11 PM UTC
A workaround for the email routing issue has been implemented. We are now seeing messages being successfully delivered, though some delays may continue. Messages that you sent between 6:00am and 10:00 am, especially those that you received an email bounce back message on, were likely not delivered and will need to be resent. Senders from outside of the NU System, including UNMC, sending you email may also need to resend their messages to you. Email sent between internal campus accounts was not impacted by this outage. ITS continues to monitor the situation and will provide additional updates as needed.
- monitoring Aug 14, 2026, 06:43 PM UTC
Our email security provider has resolved the underlying issues affecting email routing. All email services are now functioning as expected. Messages that you sent between 6:00am and 10:00 am, especially those that you received an email bounce back message on, were likely not delivered and will need to be resent. Senders from outside of the NU System, including UNMC, sending you email may also need to resend their messages to you. Email sent between internal campus accounts was not impacted by this outage.
- resolved Aug 17, 2026, 01:39 PM UTC
All systems are operating normally. This issue is resolved.
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