Email NDR Error

Some users may have trouble sending or receiving emails in Exchange Online. Affected emails might fail with an error saying the message is “corrupt.” Microsoft is working on a fix, which is being rolled out, but some emails may still be affected. The next update is expected by March 14 at 6:30 PM GMT.

Read more detail on the report below.

Some users may encounter Non-Delivery Report (NDR) failures when sending or receiving email messages

Issue ID: EX1030895
Affected services: Exchange Online
Status: Service degradation
Issue type: Incident
Start time: Mar 13, 2025, 5:03 PM GMT

User impact
Some users may encounter NDR failures when sending or receiving email messages in Exchange Online.

More info
Users may receive a Non-Delivery Report (NDR) containing an error stating “554 5.6.0 Corrupt message content”.

Scope of impact
Some users serviced by the impacted portion of infrastructure sending or receiving email in Exchange Online may be affected, although impact is limited to a small subset of messages.

Current status
Mar 14, 2025, 4:03 AM GMT
We’ve identified that impact is not limited to users sending IRM protected email as we previously communicated. We’ve updated the title, user impact, more info and scope of impact sections of this communication to reflect that new information. Our previously stated fix will continue deploying to affected infrastructure while we continue monitoring its efficacy as it progresses. Concurrently, we’ve shifted attention to our reproduction efforts and deeper log analysis to further isolate the cause of impact and identify new mitigation strategies.
Next update by:
Friday, March 14, 2025 at 6:30 PM GMT

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