The issue has been resolved and all queued emails are sent out.

We sincerely apologies for the inconvenience and will provide a write-up later today.

If you still notice any issues, do not hesitate to contact us.

We are no longer seeing any deferrals related to these IP addresses and emails are sent out accordingly.

All queued emails have been processed and delivery is back to normal.

We are implementing additional failover mechanisms to mitigate future upstream incidents.

If you experience further issues, please contact support.