TDC/Nuuday have now confirmed what everything is up and running.

It seems that newly created messages are being delivered now. Messages sent before 08:45 am CEST are marked as Undeliverable by TDC/Nuuday.
We are still waiting for a confirmation from TDC/Nuuday.

TDC/Nuuday has just confirmed that their entire SMSC is down. We do not currently have an ETA.

We have attempted to route through another operator, but since their entire SMSC is down, that does not work either.

We are currently experiencing issues towards the Danish operator TDC/Nuuday. Messages are marked as "Awaiting" but are currently not being delivered. We have attempted to route the SMS traffic through another operator.