Resolved after 5 days 8 hours, affecting O365, on April 17, 2025.
There has been a significant reduction in the number of failures for Office 365 requests with attachments larger than 3 MB. We will continue to monitor.
Affected components
Update timeline
- investigating Apr 17, 2025, 01:15 PM UTC
We received reports from a small number of customers that some drafts error when sending, with the message: "Unexpected problem sending attachment larger than 3MB to Office 365."
- investigating Apr 17, 2025, 06:47 PM UTC
Office 365 servers may sometimes fail to accept attachments larger than 3 MB. As a temporary alternative, we suggest using another method of sharing files with recipients, such as OneDrive. We have communicated the issue to Microsoft and are investigating additional mitigations.
- resolved Apr 22, 2025, 09:56 PM UTC
There has been a significant reduction in the number of failures for Office 365 requests with attachments larger than 3 MB. We will continue to monitor.
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