In my dual node exchange 2013 DAG I'm seeing Shadow redundancy queue is high at about 300 items on average. On the weekends it drops to about 150. These are the spam emails rejected by anti-spam software.
I changed safety net hold time to one day (Set-TransportConfig -SafetyNetHoldTime 1.0:0:0) expecting to have queue size drop twice but it had no effect.
Any one knows if this can be lowered or eradicated entirely?