That’s 10 rejected mail. And I am sure all of those 10 were spam. 😉 All other mail that was LIKELY spam was put into the Junk folder (you seem to miss the point, that the Junk folder exists for probable spam 🙂).
So our system worked fine. 10 spam mails rejected and put into quarantine for review. All others put into Junk and delivered. No need to to check a quaratine daily or hourly for false-positives and perhaps miss an important mail, that was just probable spam (because the sender was informed about a non-delivery in this case).
I think that speaks for the system as it is.
A general quarantine for PROBABLE spam is stupid. As I said earlier, not everyone will be able to check those mail every hour and no one will continue to do that every day. I wouldn’t either. That’s why we put it into “Junk”.
SPAM is rejected though, as it SHOULD be. And it is put into quarantine to review if you like to. There is no need to do that, as the sender does not think their mail was delivered.
Putting probable spam into quarantine is madness. If you want to do that and rely on your users to check for important mail - that might have been a false-positive - ever other minute; go ahead.
There is no way I would ever for something like that on every malicow user.