Users may receive a Non-Delivery Report (NDR) when sending emails from hotmail.com

Title: Users may receive Non-Delivery Reports (NDR) when sending emails from hotmail.com
User impact: Some users receive Non-Delivery Reports (NDR) when attempting to send emails from hotmail.com.
Current status: We've identified that additional configuration entries are impacted and we're implementing further configuration changes to resolve the issue.
Start time: Thursday, August 17, 2023, at 6:52 PM UTC
Next update by: Friday, August 18, 2023, at 7:00 PM UTC

Title: Users may receive Non-Delivery Reports (NDR) when sending emails from hotmail.com
User impact: Some users may receive Non-Delivery Reports (NDR) when attempting to send emails from hotmail.com.
Current status: We've made a configuration change to remediate impact. We're monitoring the service whilst Domain Name System (DNS) caches update, which should occur within the next hour.
Start time: Thursday, August 17, 2023, at 6:52 PM UTC
Next update by: Friday, August 18, 2023, at 5:00 PM UTC

Title: Users may receive a Non-Delivery Report (NDR) when sending emails from hotmail.com
User impact: Some users may receive a Non-Delivery Report (NDR) when attempting to send emails from hotmail.com.
Current status: We're reviewing a recent change related to email authentication as the potential root cause.
Next update by: Friday, August 18, 2023, at 4:30 PM UTC