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Did you try this parameter --> MailFileEnableDeliveryFailover=1
It should failover even in compact case.
Once you have enabled, you might want to disable the compact abort in case a mail arrives:
MailFileDisableCompactAbort=1
Those parameters only make sense in a cluster and IMHO they should be changed to be enabled by default in a cluster.
[ Daniel Nashed, https://blog.nashcom.de ]