Hi Carl,
Thanks for your update.
Could you please collect and provide the detailed non-delivery report (NDR) for further troubleshooting?
Since this is your privacy, I will send private message to you to request the non-delivery report (NDR). Therefore, I can help you troubleshoot this issue.
To access the private message:
1. Please go to the Your details section on the right side of the community site.
2. Click Private messages.
3. Click the subject title < RESOLVER.ADR.ExRecipNotFound; not found>of the response to read the message.
Thanks,
Jerry Cen