Shadow Redundancy outbound queue to Edge filling up

Hi All,
we recently added two HUB/CAS boxes to our environment, since we're migrating all client connections to a load balancer appliance.
On the two new HUB/CAS boxes the shadow redundancy queues to our two edge boxes are filling up. The same queues on the "old" HUB/CAS boxes are empty. Even though all messages appear to be delivered (status complete), the queues filling up and the
discrepancy to the other two HUB/CAS's is starting to concern me (which is why I haven't decommissioned the old boxes yet).
All Event logs on all boxes are clean and test-edgesync returns SyncStatus:Normal for both Edge boxes.
I'd appreciate any comments or suggestions.
Thx&Rgds,
Marcus

Hi,
Before going further, I’d like to confirm if your emails has been delivered successfully.
As far as I know, the shadow redundancy queue always backup emails already having been delivered. And we can wait for 2 days.
Additionally, we can enable message tracking log and SMTP log to find the root cause.
If you have any question, please feel free to let me know.
Thanks,
Angela
Angela Shi
TechNet Community Support

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