We have recently moved from a purely Exchange 2010 environment, to a hybrid Exchange 2010/O365 environment and now are using EOP for spam filtering.
One user consistently has SCL level 5 tagged e-mails appear in his Inbox. This user also has a number of user-set rules in their mailbox.
I am having trouble finding any information about what priority is given to the hidden rule I am aware of that handles putting spam in the Junk Mail folder, or diverting it from it, so I can eliminate one of the user's rules having the "stop processing more rules" setting set which with that hidden rule having a priority lower than the user-set rules could explain this behaviour (though this would seem like a significant flaw in Microsoft's design of user/system mailbox management rules processing).
Running Get-InboxRules
also shows server-side rule "contains errors", which I can conceivably think might also/instead be halting rules with a lower priority from running, perhaps including the aforementioned hidden rule.
Can anyone advise whether either hypothesis above seems reasonable, and perhaps point me to information I have tried to google for that provides more detail about how these hidden rules fit into the process of processing mail?