Purview DLP Blocks Sharing Files with Specific Domains or Users

A new DLP rule is available to control sharing of SharePoint and OneDrive files with selected domains and email addresses. The new rule supports an allow list (permit sharing) and can also specify a deny list (block sharing). The user interface takes a little getting used to, but when everything is configured and SharePoint has had a chance to respond to the block, the rule works and any attempt by a blocked user to use a sharing link is refused.

https://office365itpros.com/2026/07/22/block-sharing-dlp-sharepoint/