I have been having a lot problems with spam. Lots of messages that are spam are having SCL levels of 0-3 so I have resorted to setting up a spam quarantine mailbox that gets anything that is 3 and up with 8 and 9 getting deleted.
I have been catching a lot of spam so that it does not go to the users' mailbox but I still have users complaining about spam. I looked into one of their mailboxes and noticed that they are getting emails that have SCL levels of higher than 3, most of them are 6. Outlook is then processing it and marking it as spam correctly which is good. But those emails should not have gotten to the users' mailboxes in the first place. They should have gone to the spam quarantine mailbox.
I have set the organization config scljunkthreshold to 2, content filter config quarantine mailbox scl level to 3 and then delete to 8. What else can I do so that all mail that has a scl of more than 3 go to the quarantine mailbox?