Email Delivery Issue to Outlook.com

Microsoft has identified the cause of the issue and have implemented a fix. They will now monitor the service. We request customers to follow Microsoft Status Page moving forward for further updates:

https://portal.office.com/servicestatus

While Microsoft continues to work on this issue, we have identified that impacted customers are unable to send emails to users with an outlook.com domain distribution list. Individual emails to outlook.com users are not impacted.

All Email Security Services continue to remain operational and Microsoft is working to address this issue. For more information on the fix being worked on by Microsoft, please follow their updates here: https://portal.office.com/servicestatus

We are currently experiencing issues delivering emails to a small subset of customers/recipients using Outlook.com email addresses. Our investigation shows the issue is on Microsoft's end.

All Email Security Services are functioning without issue and all the emails which are not being delivered to Outlook.com will be queued. Broadcom will continue to hold emails while Microsoft addresses the issue.

We will provide further updates once we have more information available.