Change in behavior of safe attachments preview feature?

[JrothSKV]

Up until recently, the preview feature of deliver but only show preview used to show a placeholder in the email until scanning was done. Now it appears to be delivered immediately to the users mailbox, but opens in protected mode until the ATP scan completes. Is this change in behavior by design?

[yogkumgit]

@JrothSKV please indicate the name of the document, your feedback is related to. Thanks

[JrothSKV]

@JrothSKV please indicate the name of the document, your feedback is related to. Thanks

https://docs.microsoft.com/microsoft-365/security/office-365-security/safe-attachments#dynamic-delivery-in-safe-attachments-policies

The behavior now seems to be no placeholder/preview, it simply opens in protected mode with an ATP banner until scanning is finished.

[chrisda]

Checking

[chrisda]

@JrothSKV, I finally got a response from a knowledgeable party, and he doesn't see anything wrong with what you're saying, but he also doesn't see anything wrong with the current content in the topic.

Can you please edit the existing text from the topic below to add/remove/clarify?

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The Dynamic Delivery action in Safe Attachments policies seeks to eliminate any email delivery delays that might be caused by Safe Attachments scanning. The body of the email message is delivered to the recipient with a placeholder for each attachment. The placeholder remains until the attachment is found to be safe, and then the attachment becomes available to open or download.

If an attachment is found to be malicious, the message is quarantined.

Most PDFs and Office documents can be previewed in safe mode while Safe Attachments scanning is underway. If an attachment is not compatible with the Dynamic Delivery previewer, the recipients will see a placeholder for the attachment until Safe Attachments scanning is complete.

If you're using a mobile device, and PDFs aren't rendering in the Dynamic Delivery previewer on your mobile device, try opening the message in Outlook on the web (formerly known as Outlook Web App) using your mobile browser.

Here are some considerations for Dynamic Delivery and forwarded messages:

• If the forwarded recipient is protected by a Safe Attachments policy that uses the Dynamic Delivery option, then the recipient sees the placeholder, with the ability to preview compatible files.
• If the forwarded recipient is not protected by a Safe Attachments policy, the message and attachments will be delivered without any Safe Attachments scanning or attachment placeholders.