Required Configuration Change for DLP Cloud Service for Email Reflecting Mode

Data Loss Prevention

29 more products

22765

03 February 2024

30 October 2023

Update January 2024
DLP Support and Engineering have confirmed a new requirement from Microsoft in relation to this advisory. If you have previously followed instructions to make configuration changes in Microsoft 365, review the updated instructions on necessary changes that you must make for your Inbound Connector in Microsoft 365.

Issue

Microsoft is changing the behavior of its inbound connector. You can find details about this change from Microsoft at Updated Requirements for SMTP Relay through Exchange Online. 

This change only impacts Symantec Data Loss Prevention customers using Configuring Microsoft 365 to use Microsoft 365 for Email Delivery (Reflecting Mode). Due to these changes, emails sent with a null sender are rejected when delivered back to Microsoft 365. 

Resolution

To avoid any issues, Symantec Data Loss Prevention has created a set of updated instructions that you can use to address this upcoming change. Symantec Data Loss Prevention Cloud Service for Email Reflecting mode customers will be required to make some configuration changes based on these instructions.

If you have questions or require assistance, contact Broadcom Technical Support. We will provide additional updates as new information becomes available.