Fix possible mail loop insight in the new EAC in Exchange Online
A mail loop is bad because it wastes system resources, consumes your organization's mail volume quota, and sends confusing non-delivery reports (also known as NDRs or bounce messages) to the original senders.
The Fix possible mail loop insight in the Insights dashboard in the new Exchange admin center (new EAC) reports when a mail loop is detected in your organization, the email domains that are involved in the loop, and the number of messages from the previous day that were in the loop.
You can click View details to see the details in a flyout where we identify the most common mail loop scenarios and provide the recommended actions (if available) to fix the loop.
For more information about other mail flow insights in the mail flow dashboard, see Mail flow insights in the new Exchange admin center.