Some users may be unable to open inbound Secure/Multipurpose Internet Mail Extensions (S/MIME) encrypted email messages
ID: EX1192586
Issue type: Incident
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Status
Service Degradation
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Impacted services
Exchange Online
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Details
Title: Some users may be unable to open inbound Secure/Multipurpose Internet Mail Extensions (S/MIME) encrypted email messages
User impact: Users may intermittently be unable open some inbound S/MIME encrypted email messages in Exchange Online.
More info: This issue strictly impacts users with the Dynamic Delivery policy enabled.
We've temporarily disabled Dynamic Delivery while we work to resolve this issue. This action may result in potential delays of up to fifteen minutes for users to receive email messages with attachments. The length of the delay will depend on the attachments associated with the email message.
Additionally, some users see a "Safe Attachments Scan in Progress" message upon opening an encrypted inbound email message.
Current status: While we review HTTP Archive format (HAR) network trace logs to isolate the underlying cause of impact, we've disabled Dynamic Delivery to avoid new email messages from becoming impacted. In parallel, we're in the process of validating a fix to allow delivered S/MIME encrypted email messages to be viewed as expected.
Scope of impact: Some users with Dynamic Delivery enabled attempting to open S/MIME encrypted email messages may be impacted.
Start time: Sunday, November 30, 2025, at 12:00 AM UTC
Next update by: Friday, December 5, 2025, at 10:30 PM UTC
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